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Presenting Your Research
After you have finished doing your mathematics research, you will need
to present your findings to others. There are three main ways to do
this:
The following sections provide information about each of these presentation
strategies.
Writing Up
Your Research
Your project write-up is a chance to synthesize what you have learned
about your mathematics research problem and to share it with others.
Most people find that when they complete their write-up it gives them
quite a bit of satisfaction. The process of writing up research forces
you to clarify your own thinking and to make sure you really have rigorous
arguments. You may be surprised to discover how much more you will learn
by summarizing your research experience!
If you have ever looked at a mathematics journal to see how mathematicians
write up new results, you may have found that everything seemed neat
and polished. The author often poses a question and then presents a
proof that leads neatly, and sometimes elegantly, to his or her solution.
Mathematicians rarely talk about the dead ends they met along the way
in these formal presentations. Your write-up will be different. We hope
that you will tell your reader about your thought process. How did you
start? What did you discover? Where did that lead you? What were your
conjectures? Did you disprove any of them? How did you prove the ones
that were true? By answering these questions, you will provide a detailed
map that will take the reader through your research experience.
This guide will give you a brief overview of the parts of a mathematics
research paper. Following the guide is a sample write up so you can
see how one person wrote about her research experience and shared her
results.
A formal mathematics research paper includes a number of sections.
These will be appropriate for your write-up as well. The sections of
the report are linked so that you can see an example of each part in
the sample write-up that follows. Note that not all mathematical research
reports contain all of the sections. For example, you might not have
any appendices to include or you may not do a literature review. However,
your write-up should definitely contain parts 1, 2, 4, 5, 6 and 7.
1. Title [see sample]
As with any paper you write, a title is important. It should catch
the attention of the reader as well as reflect the content of your
paper.
2. Abstract [see sample]
An abstract is a summary paragraph in which you explain the basic
purpose of your paper, state the question(s) you answered, and tell
the reader what you proved. It provides an outline of your paper so
that someone who might be interested in your paper will know what
he or she will learn by reading it. Usually people write their abstract
after they have finished writing the body of the report because
it summarizes what they wrote, not what they plan to write.
3. Literature Review
If you did research about your topic by consulting existing literature
and then built upon what you learned by extending the ideas, then
it is appropriate to include a literature review in your paper. This
section should read as an analytical essay and tell your reader about
the state of the art in your research area. Provide the reader with
the background and the context of your topic, demonstrating your expertise
in the process. It is appropriate to identify and discuss books, articles
and other source materials that you read for your project. Everything
in your literature review should be mentioned in your reference section,
but not everything in your reference section belongs in your literature
review. You are merely commenting on the most valuable material you
have identified that you will need to assimilate for your project.
This section should be rich in footnotes or parenthetical references
to original sources.
In the literature review section you may answer questions such as
What kind of research has been done before? What
kind of relevant studies or techniques needed to be mastered to do
your project? How have others gone about trying to solve
your problem, and how does your approach differ?
4. Statement of
the Problem/Introduction [see sample]
Here you set the stage for your paper. A brief introduction
should give the reader some understanding of the context in which
you are working. What was the source of inspiration for your problem?
Is it a modification of some other question? Why is this problem important
or interesting to you (or someone else?) Be sure to state the question
or questions that you will examine in your report. You dont
want to do any proving here, just tell the reader what questions you
plan to discuss in your paper.
5. Body of the Report [see
sample]
Take the reader on a trip through your research project. Using your
log book
as your guide, start with your initial explorations and conjectures.
Explain any definitions and notation that you developed. Tell the reader
what you discovered as you learned more about the problem. Provide any
numeric, geometric or symbolic examples that guided you toward your
conjectures. Show your results. Explain how you proved your conjectures.
The body of your report should be a mix of English narrative and
more abstract representations. Be sure to include lots of examples
to help your reader understand your reasoning. If your paper is very
long, you can divide the body of your report into sections so that
it easier to tackle the various aspects of your work.
6. Ideas for Further
Research [see sample]
As you worked on your research project, questions that you didnt
have time to answer, or that were beyond the scope of what you were
doing, undoubtedly surfaced. State those questions here. Maybe you
will inspire someone else to tackle those questions. Maybe you will
work on them yourself at another time. By posing them here, you participate
in advancing the field of mathematics. You place your work within
a larger framework of inquiry.
7. References [see sample]
As with any research paper, you must give credit to the people whose
work you used in writing your report. Include articles and books that
you used. It is also appropriate to cite articles and other material
that you found on the World Wide Web. There is more than one accepted
form for referencing materials; here we provide examples using the
APA (American Psychological Association) style. For more complete
instructions you may find one of the APA Style guides helpful. Most
libraries have a copy.
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Book with one author
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Gauss, Carl Friedrich. (1966). Disquisitiones arithmeticae
(English edition). New York, NY: Springer-Verlag.
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Book with two authors
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ODaffer, Phares G. & Clemens, Stanley R. (1977).
Geometry: An investigative approach. Menlo Park, CA:
Addison-Wesley Publishing Company.
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Edited book
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Fadiman, Clifton (Ed.). (1997). Fantasia mathematica.
New York: Copernicus.
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Book, edition other than first
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Brown, Stephen I. & Walter, Marion I. (1990). The art
of problem posing. (2nd ed.) Hillsdale, NJ: Erlbaum.
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Essay or chapter in a collection or anthology
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Epp, Susanna S. (1994) The role of proof in problem solving.
In. Schoenfeld, Alan H. (Ed). Mathematical thinking and problem
solving. (pp. 257-269). Hillsdale, NJ: Erlbaum.
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Journal Article
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Keiser, Jane M. (2000, April). The role of definition. Mathematics
Teaching in the Middle School 5, 8. 506-511.
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Article in a magazine
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Shasha, Dennis E. (2002, January). Pinpointing a Polar Bear.
Scientific American, 286, p. 96.
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Daily newspaper article (note multiple pages)
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Aoki, Naomi (2001, December 20). Genetic mutation gives hope
to those with osteoporosis. Boston Globe, pp. E1, E6.
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Abstract on CD-ROM
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Brown, G. N. (1993). Borderline states: Incest and adolescence
[CD-ROM]. Journal of Analytical Psychology, 38 (1), 23-25.
Abstract from SilverPlatter File: Psyclit Item 80-25636
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Article posted on a web site
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Bridgewater State College. (1998, August 5). APA Style:
Sample Bibliographic Entries (4th ed). Bridgewater, MA:
Clement C. Maxwell Library. Retrieved February 12, 2002, from
the World Wide Web: http://www.bridgew.edu/depts/maxwell/apa.htm
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8. Appendices
In the appendices you should include any data or material that supported
your research but that was too long to include in the body of your
paper. Materials in an appendix should be referenced at some point
in the body of the report.
Some examples:
If you wrote a computer program to generate more data than
you could produce by hand, you should include the code and some
sample output.
If you collected statistical data using a survey, include
a copy of the survey.
If you have lengthy tables of numbers that you do not want
to include in the body of your report, you can put them in an appendix.
Sample Write-Up
SEATING UNFRIENDLY CUSTOMERS
A Combinatorics Problem
By Lisa Honeyman
February 12, 2002
Abstract
The answers to combinatorial questions concerning unfriendly customers
at a morning coffee shop are found. It is proven that if there are n
seats and c customers who refuse to sit next to each other
at a coffee shop counter, then there are n-c+1Pc
ways for them to sit. It is also proven that if there are n
seats and c customers who refuse to sit next to each other
at a circular table, then there are ways
for them to sit.
The Problem
In a certain coffee shop, the customers are grouchy in the early morning
and none of them wishes to sit next to another at the counter.
1. Suppose there are ten seats at the counter. How many different
ways can three early morning customers sit at the counter so that
no one sits next to anyone else?
2. What if there are n seats at the counter?
3. What if we change the number of customers?
4. What if, instead of a counter, there was a round table and people
refused to sit next to each other?

Assumptions
I am assuming that the order in which the people sit matters. So, if
three people occupy the first, third and fifth seats, there are actually
6 (3!) different ways they can do this. I will explain more thoroughly
in the body of my report.
Body of the Report
At first there are 10 seats available for the 3 people to sit in. But
once the first person sits down, that limits where the second person
can sit. Not only cant he sit in the now-occupied seat, he cant
sit next to it either. What confused me at first was that if the first
person sat at one of the ends, then there were 8 seats left for the
second person to chose from. But if the 1st person sat somewhere
else, there were only 7 remaining seats available for the second person.
I decided to look for patterns. By starting with a smaller number of
seats, I was able to count the possibilities more easily. I was hoping
to find a pattern so I could predict how many ways the 10 people could
sit without actually trying to count them all. I realized that the smallest
number of seats I could have would be 5. Anything less wouldnt
work because people would have to sit next to each other. So, I started
with 5 seats. I called the customers A, B, and C.
With 5 seats there is only one configuration that works.
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1st
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2nd
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3rd
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4th
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5th
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A
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B
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C
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As I said in my assumptions section, I thought that the order in which
the people sit is important. Maybe one person prefers to sit near the
coffee maker or by the door. These would be different, so I decided
to take into account the different possible ways these 3 people could
occupy the 3 seats shown above. I know that ABC can be arranged in 3!
= 6 ways. (ABC, ACB, BAC, BCA, CAB, CBA). So there are 6 ways to arrange
3 people in 5 seats with spaces between them. But, there is only one
configuration of seats that can be used. (The 1st, 3rd,
and 5th).
Next, I tried 6 seats. I used a systematic approach to show that there
are 4 possible arrangements of seats. This is how my systematic approach
works:
Assign person A to the 1st seat. Put person B in the 3rd
seat, because he cant sit next to person A. Now, person C can
sit in either the 5th or 6th positions. (see the
top two rows in the chart, below.) Next suppose that person B sits in
the 4th seat (the next possible one to the right.) That leaves
only the 6th seat free for person C. (see row 3, below.)
These are all the possible ways for the people to sit if the 1st
seat is used. Now put person A in the 2nd seat and person
B in the 4th. There is only one place where person C can
sit, and thats in the 6th position. (see row 4, below.)
There are no other ways to seat the three people if person A sits in
the 2nd seat. So, now we try putting person A in the 3rd
seat. If we do that, there are only 4 seats that can be used, but we
know that we need at least 5, so there are no more possibilities.
| |
1st
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2nd
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3rd
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4th
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5th
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6th
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row 1
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A
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B
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C
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row 2
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A
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B
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C
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row 3
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A
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B
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C
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row 4
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A
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B
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C
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Possible seats 3 people could occupy if there are 6
seats
Once again, the order the people sit in could be ABC, BAC, etc. so
there are 4 * 6 = 24 ways for the 3 customers to sit in 6 seats with
spaces between them.
I continued doing this, counting how many different groups of seats
could be occupied by the three people using the systematic method I
explained. Then I multiplied that number by 6 to account for the possible
permutations of people in those seats. I created the following table
of what I found.
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Total # of seats
(n)
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# of groups of 3 possible
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# ways 3 people can sit in n seats
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5
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1
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6
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6
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4
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24
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7
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10
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60
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8
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20
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120
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Next I tried to come up with a formula. I decided to look
for a formula using combinations or permutations. Since we are looking
at 3 people, I decided to start by seeing what numbers I would get if
I used nC3 and nP3.
3C3 = 1 4C3
= 4 5C3 = 10 6C3
= 20
3P3 = 6 4P3
= 24 5P3 = 60 6P3
= 120
Surprisingly enough, these numbers matched the numbers I found in my
table. However, the n in nPr and nCr
seemed to be two less than the total # of seats I was investigating.
Conjecture 1:
Given n seats at a lunch counter, there are n-2C3
ways to select the three seats in which the customers will sit such
that no customer sits next to another one. There are n-2P3
ways to seat the 3 customers in such a way than none sits next to another.
After I found a pattern, I tried to figure out why n-2C3
works. (If the formula worked when order didnt matter it could
be easily extended to when the order did, but the numbers are smaller
and easier to work with when looking at combinations rather than permutations.)
Proof:
In order to prove Conjecture 1 convincingly, I need to show two things:
(1) Each n 2 seat choice leads to a legal n
seat configuration.
(2) Each n seat choice resulted from a unique n
2 seat configuration.
To prove these two things I will show
(3) There is a function, f, such that f(n
2 non-separated seats)
n separated seats
(4) There is a function, g, such that g(n
separated seats) n
2 non-separated seats
And then conclude that these two procedures are both functions and
therefore 11.
Claim (1): Each (n
2)-seat choice leads to a legal n seat configuration.
Suppose there were only n 2 seats to begin with. First
we pick three of them in which to put people, without regard to whether
or not they sit next to each other. But, in order to guarantee that
they dont end up next to another person, we introduce an empty
chair to the right of each of the first two people. It would look like
this:

We dont need a third new seat because once the person
who is farthest to the right sits down, there are no more customers
to seat. So, we started with n 2 chairs but added two
for a total of n chairs. Anyone entering the restaurant after
this procedure had been completed wouldnt know that there had
been fewer chairs before these people arrived and would just see three
customers sitting at a counter with n chairs. This procedure
guarantees that two people will not end up next to each other. Thus,
each (n 2)-seat choice leads to a unique, legal n
seat configuration.
Using mathematical notation: Suppose s1, s2
and s3 are the locations selected with all three
distinct. That is, s2
s1 + 1 and s3
s2 + 1. Then the people will actually end up sitting
in seats at locations s1'= s1,
s2'= s2 + 1 and s3'
= s3 + 2. Combining these formulas with the original
conditions yields:
s2' = s2 + 1
s1
+ 2 = s1' + 2
s3' = s3 + 2
s2
+ 3 = s2' + 2
Therefore, positions s1' s2',
and s3' are all separated by at least one vacant
seat.
This is a function that maps each combination of 3 seats
selected from n 2 seats onto a unique arrangement of
n seats with 3 separated customers. Therefore, it is invertible.
f(n 2 non-separated seats)
n separated seats
Claim (2): Each 10-seat choice has a unique 8-seat configuration.
Given a legal 10-seat configuration, each of the two left-most diners
must have an open seat to his/her right. Remove it and you get a unique
8-seat arrangement. If, in the 10-seat setting, we have q1
> q2, q3; q3
1 > q2, and q2
1 > q1, then the 8 seat positions are q1'
= q2, q2' = q2
1, and q3' = q3
2. Combining these equations with the conditions we have
q2' = q2 1 which implies
q2' > q1 = q1'
q3' = q3 2 which implies
q3' > q2 1 = q2'
Since q3' > q2' > q1',
these seats are distinct. If the diners are seated in locations q1,
q2, and q3 (where q3
1 > q2 and q2
1 > q1) and we remove the two seats to the right
of q1 and q2, then we can see
that the diners came from q1, q2
1, and q3 2. This is a function that
maps a legal 10-seat configuration to a unique 8-seat configuration.
g(n separated seats)
n 2 non-separated seats.
The size of a set can be abbreviated s( ). I
will use the abbreviation S to stand for n separated
seats and N to stand for the n 2 non-separated
seats.
s(S)
s(N) because f(N)
S
and s(N)
s(S) because g(S)
N
therefore s(N) = s(S).
Because the sets are the same size, these functions are 11.
Using the technique of taking away and adding empty chairs, I can extend
the problem to include any number of customers. For example, if there
were 4 customers and 10 seats there would be 7C4
= 35 different combinations of chairs to use and 7P4
= 840 ways for the customers to sit (including the fact that order matters).
You can imagine that three of the ten seats would be introduced by three
of the customers. So, there would only be 7 to start with.
In general, given n seats and c customers, we remove
c-1 chairs and select the seats for the c customers.
This leads to the formula n-(c-1)Cc
= n-c+1Cc for the number
of arrangements.
Once the number of combinations of seats is found, it is necessary
to multiply by c! to find the number of permutations. Looking
at the situation of 3 customers and using a little algebraic manipulation,
we get the nP3 formula shown below.
n-2C3 = =
(by definition)
If we multiply n-2C3 by 3! we get
=
n-2P3 (also by definition)
This same algebraic manipulation works if you have c people
rather than 3, resulting in n-c+1Pc
Answers to Questions
-
With 10 seats there are 8P3
= 336 ways to seat the 3 people.
-
My formula for n seats and
3 customers is: n-2P3.
-
My general formula for n seats
and c customers, is: n-(c-1)Pc
= n-c+1Pc
_________________________________________________________________
_
After I finished looking at this question as it applied to people sitting
in a row of chairs at a counter, I considered the last question, which
asked would happen if there were a round table with people sitting,
as before, always with at least one chair between them.
I went back to my original idea about each person dragging in an extra
chair that she places to her right, barring anyone else from sitting
there. There is no end seat, so even the last person needs to bring
an extra chair because he might sit to the left of someone who has already
been seated. So, if there were 3 people there would be 7 seats for them
to choose from and 3 extra chairs that no one would be allowed to sit
in. By this reasoning, there would be 7C3 = 35
possible configurations of chairs to choose and 7P3
= 840 ways for 3 unfriendly people to sit at a round table.
Conjecture 2: Given 3 customers and n seats
there are n-3C3 possible groups of 3
chairs which can be used to seat these customers around a circular table
in such a way that no one sits next to anyone else.
My first attempt at a proof: To test this conjecture
I started by listing the first few numbers generated by my formula:
When n = 6 6-3C3
= 3C3 = 1
When n = 7 7-3C3
= 4C3 = 4
When n = 8 8-3C3
= 5C3 = 10
When n = 9 9-3C3
= 6C3 = 20
Then I started to systematically count the first few numbers of groups
of possible seats. I got the numbers shown in the following table. The
numbers do not agree, so something is wrong probably my conjecture!
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Total # of seats (n)
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# of groups of 3 possible
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# of possible configurations
|
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6
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2
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12
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7
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7
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42
|
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8
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16
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96
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9
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30
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180
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I looked at a circular table with 8 people and tried to
figure out the reason this formula doesnt work. If we remove 3
seats (leaving 5) there are 10 ways to select 3 of the 5 remaining chairs.
(5C3).
The circular table at the left in the figure below shows the n
3 (in this case 5) possible chairs from which 3 will be randomly
chosen. The arrows point to where the person who selects that chair
could end up. For example, if chair A is selected,
that person will definitely end up in seat #1 at the table with 8 seats.
If chair B is selected but chair A
is not, then seat 2 will end up occupied. However,
if chair A and B are selected, then
the person who chose chair B will end up in seat 3.
The arrows show all the possible seats in which a person who chose a
particular chair could end. Notice that it is impossible for seat #8
to be occupied. This is why the formula 5C3 doesnt
work. It does not allow all seats at the table of 8 to be chosen.

The difference is that in the row-of-chairs-at-a-counter problem there
is a definite starting point and ending point.
The first chair can be identified as the one farthest to the left, and
the last one as the one farthest to the right. These seats are unique
because the starting point has no seat to the left of it
and the ending point has no seat to its right. In a circle,
it is not so easy.
Using finite differences I was able to find a formula that generates
the correct numbers:
tn = (n3
9n2 + 20n). I used this formula
to predict the next two numbers in the chart and confirmed them by hand.
|
Total # of seats (n)
|
# of groups of 3 possible
|
# of possible configurations
|
|
10
|
50
|
300
|
|
11
|
77
|
462
|
Conjecture 3: Given 3 customers and n seats
there are (n3
9n2 + 20n) = possible
groups of 3 chairs that can be used to seat these customers around a
circular table in such a way that no one sits next to anyone else and
n(n 4)(n 5) possible configurations
if order matters. Note that the factored form of this cubic function
gives clues to how the problem works.
Proof: We need to establish a starting point.
This could be any of the n seats. So, we select one and seat
person A in that seat. Person B cannot sit on this persons left
(as he faces the table), so we must eliminate that as a possibility.
Also, remove any 2 other chairs, leaving (n 4) possible
seats where the second person can sit. Select another seat and put person
B in it. Now, select any other seat from the (n 5) remaining
seats and put person C in that. Finally, take the two seats that were
previously removed and put one to the left of B and one to the left
of C.
The following diagram should help make this procedure clear.
Finally, if we decide that the order in which the diners sit does not
matter, we can divide the function f(n) = n(n
4)(n 5) by 3! so we dont count each configuration
6 times. This results in the function: g(n) = ,
which predicts how many groups of 3 chairs can be used to seat unfriendly
customers around a circular table.
In a manner similar to the method I used in the row-of-chairs-at-a-counter
problem, this could be proven more rigorously.
An Idea for Further Research:
Consider a grid of chairs in a classroom and a group of 3 very smelly
people. No one wants to sit adjacent to anyone else. (There would be
9 empty seats around each person.) Suppose there are 16 chairs in a
room with 4 rows and 4 columns. How many different ways could 3 people
sit? What if there was a room with n rows and n columns?
What if it had n rows and m columns?
References:
Abrams, Joshua. Education Development Center, Newton, MA. December
2001 - February 2002. Conversations with my mathematics mentor.
Brown, Richard G. 1994. Advanced Mathematics. Evanston, Illinois.
McDougal Littell Inc. pp. 578-591
The Oral Presentation
Giving an oral presentation about your mathematics research can be
very exciting! You have the opportunity to share what you have learned,
answer questions about your project, and engage others in the topic
you have been studying. After you finish doing your mathematics research,
you may have the opportunity to present your work to a group of people
such as your classmates, judges at a science fair or other type of contest,
or educators at a conference. With some advance preparation, you can
give a thoughtful, engaging talk that will leave your audience informed
and excited about what you have done.
Planning for Your Oral Presentation
In most situations, you will have a time limit of between 10 and 30
minutes in which to give your presentation. Based upon that limit, you
must decide what to include in your talk. Come up with some good examples
that will keep your audience engaged. Think about what vocabulary, explanations,
and proofs are really necessary in order for people to understand
your work. It is important to keep the information as simple as possible
while accurately representing what youve done. It can be difficult
for people to understand a lot of technical language or to follow a
long proof during a talk. As you begin to plan, you may find it helpful
to create an outline of the points you want to include. Then you can
decide how best to make those points clear to your audience.
You must also consider who your audience is and where the presentation
will take place. If you are going to give your presentation to a single
judge while standing next to your project display, your presentation
will be considerably different than if you are going to speak from the
stage in an auditorium full of people! Consider the background of your
audience as well. Is this a group of people that knows something about
your topic area? Or, do you need to start with some very basic information
in order for people to understand your work? If you can tailor your
presentation to your audience, it will be much more satisfying for them
and for you.
No matter where you are presenting your speech and for whom, the structure
of your presentation is very important. There is an old bit of advice
about public speaking that goes something like this: Tell em what
youre gonna tell em. Tell em. Then tell em what
you told em. If you use this advice, your audience will
find it very easy to follow your presentation. Get the attention of
the audience and tell them what you are going to talk about, explain
your research, and then following it up with a re-cap in the conclusion.
Writing Your Introduction
Your introduction sets the stage for your entire presentation. The
first 30 seconds of your speech will either capture the attention of
your audience or let them know that a short nap is in order. You want
to capture their attention. There are many different ways to start your
speech. Some people like to tell a joke, some quote famous people, and
others tell stories.
Here are a few examples of different types of openers.
You can use a quote from a famous person that is engaging and relevant
to your topic. For example:
Benjamin Disraeli once said, There are three kinds of
lies: lies, damn lies, and statistics. Even though I am going
to show you some statistics this morning, I promise I am not going
to lie to you! Instead, . . .
The famous mathematician, Paul Erdös, said, A Mathematician
is a machine for turning coffee into theorems. Today Im
here to show you a great theorem that I discovered and proved during
my mathematics research experience. And yes, I did drink a lot of
coffee during the project!
According to Stephen Hawking, Equations are just the
boring part of mathematics. With all due respect to Dr. Hawking,
I am here to convince you that he is wrong. Today Im going to
show you one equation that is not boring at all!
Some people like to tell a short story that leads into their discussion.
Last summer I worked at a diner during the breakfast shift.
There were 3 regular customers who came in between 6:00 and 6:15 every
morning. If I tell you that you didnt want to talk to these
folks before theyve had their first cup of coffee, youll
get the idea of what they were like. In fact, these people never sat
next to each other. Thats how grouchy they were! Well, their
anti-social behavior led me to wonder, how many different ways could
these three grouchy customers sit at the breakfast counter without
sitting next to each other? Amazingly enough, my summer job serving
coffee and eggs to grouchy folks in Boston led me to an interesting
combinatorics problem that I am going to talk to you about today.
A short joke related to your topic can be an engaging way to start
your speech.
It has been said that there are three kinds of mathematicians: those
who can count and those who cant.
All joking aside, my mathematics research project involves counting.
I have spent the past 8 weeks working on a combinatorics problem..
. .
To find quotes to use in introductions and conclusions try: http://www.quotationspage.com/
To find some mathematical quotes, consult the Mathematical Quotation
Server: http://math.furman.edu/~mwoodard/mquot.html
To find some mathematical jokes, you can look at the Profession
Jokes web site: http://www.geocities.com/CapeCanaveral/4661/projoke22.htm
There is a collection of math jokes compiled by the Canadian Mathematical
Society at http://camel.math.ca/Recreation/
After you have the attention of your audience, you must introduce your
research more formally. You might start with a statement of the problem
that you investigated and what lead you to choose that topic. Then you
might say something like this,
Today I will demonstrate how I came to the conclusion that
there are n(n 4)(n 5)
ways to seat 3 people at a circular table with n seats in
such a way that no two people sit next to each other. In order to
do this I will first explain how I came up with this formula and then
I will show you how I proved it works. Finally, I will extend this
result to tables with more than 3 people sitting at them.
By providing a brief outline of your talk at the beginning and reminding
people where you are in the speech while you are talking, you will be
more effective in keeping the attention of your audience. It will also
make it much easier for you to remember where you are in your speech
as you are giving it.
The Middle of Your Presentation
Because you only have a limited amount of time to present your work,
you need to plan carefully. Decide what is most important about your
project and what you want people to know when you are finished. Outline
the steps that people need to follow in order to understand your research
and then think carefully about how you will lead them through those
steps. It may help to write your entire speech out in advance. Even
if you choose not to memorize it and present it word for word, the act
of writing will help you clarify your ideas. Some speakers like to display
an outline of their talk throughout their entire presentation. That
way, the audience always knows where they are in the presentation and
the speaker can glance at it to remind him or herself what comes next.
An oral presentation must be structured differently than a written
one because people cant go back and re-read a complicated
section when they are at a talk. You have to be extremely clear so that
they can understand what you are saying the first time you say it. There
is an acronym that some presenters like to remember as they prepare
a talk: KISS. It means, Keep It Simple, Student.
It may sound silly, but it is good advice. Keep your sentences short
and try not to use too many complicated words. If you need to use technical
language, be sure to define it carefully. If you feel that it is important
to present a proof, remember that you need to keep things easy to understand.
Rather than going through every step, discuss the main points and the
conclusion. If you like, you can write out the entire proof and include
it in a handout so that folks who are interested
in the details can look at them later. Give lots of examples! Not only
will examples make your talk more interesting, but they will also make
it much easier for people to follow what you are saying.
It is useful to remember that when people have something to look at,
it helps to hold their attention and makes it easier for them to understand
what you are saying. Therefore, use lots of graphs and other visual
materials to support your work. You can do this using posters, overhead
transparencies, models, or anything else that helps make your explanations
clear.
Using Materials
As you plan for your presentation, consider what equipment or other
materials you might want use. Find out what is available in advance
so you dont spend valuable time creating materials that you will
not be able to use. Common equipment used in talks include an over-head
projector, VCR, computer, or graphing calculator. Be sure you know how
to operate any equipment that you plan to use. On the day of your talk,
make sure everything is ready to go (software loaded, tape at the right
starting point etc.) so that you dont have technical difficulties.
Visual aides can be very useful in a presentation. (See Displaying
Your Results for details about poster design.) If you are going
to introduce new vocabulary, consider making
a poster with the words and their meanings to display throughout your
talk. If people forget what a term means while you are speaking, they
can refer to the poster you have provided. (You could also write the
words and meanings on a black/white board in advance.) If there are
important equations that you would like to show, you can present them
on an overhead transparency that you prepare prior to the talk. Minimize
the amount you write on the board or on an overhead transparency during
your presentation. It is not very engaging for the audience to sit watching
while you write things down. Prepare all equations and materials in
advance. If you dont want to reveal all of what you have written
on your transparency at once, you can cover up sections of your overhead
with a piece of paper and slide it down the page as you move along in
your talk. If you decide to use overhead transparencies, be sure to
make the lettering large enough for your audience to read. It also helps
to limit how much you put on your transparencies so they are not cluttered.
Lastly, note that you can only project approximately half of a standard
8.5" by 11" page at any one time, so limit your information to displays
of that size.
Presenters often create handouts
to give to members of the audience. Handouts may include more information
about the topic than the presenter has time to discuss, allowing listeners
to learn more if they are interested. Handouts may also include exercises
that you would like audience members to try, copies of complicated diagrams
that you will display, and a list of resources where folks might find
more information about your topic. Give your audience the handout before
you begin to speak so you dont have to stop in the middle of the
talk to distribute it. In a handout you might include:
A proof you would like to share, but you dont have time
to present entirely.
Copies of important overhead transparencies that you use in
your talk.
Diagrams that you will display, but which may be too complicated
for someone to copy down accurately.
Resources that you think your audience members might find
useful if they are interested in learning more about your topic.
The Conclusion
Ending your speech is also very important. Your conclusion should leave
the audience feeling satisfied that the presentation was complete. One
effective way to conclude a speech is to review what you presented and
then to tie back to your introduction. If you used the Disraeli quote
in your introduction, you might end by saying something like,
I hope that my presentation today has convinced you that . . .
Statistical analysis backs up the claims that I have made, but more
importantly, . . . .
And thats no lie!
Getting Ready
After you have written your speech and prepared your visuals, there
is still work to be done.
- Prepare your notes on cards rather than full-size sheets of paper.
Note cards will be less likely to block your face when you read from
them. (They dont flop around either.) Use a large font that
is easy for you to read. Write notes to yourself on your notes. Remind
yourself to smile or to look up. Mark when to show a particular slide,
etc.
- Practice! Be sure you know your speech well enough that you can
look up from your notes and make eye contact with your audience. Practice
for other people and listen to their feedback.
- Time your speech in advance so that you are sure it is the right
length. If necessary, cut or add some material and time yourself again
until your speech meets the time requirements. Do not go over time!
- Anticipate questions and be sure you are prepared to answer them.
- Make a list of all materials that you will need so that you are
sure you wont forget anything.
- If you are planning to provide a handout, make a few extras.
- If you are going to write on a whiteboard or a blackboard, do it
before starting your talk.
The Delivery
How you deliver your speech is almost as important as what you say.
If you are enthusiastic about your presentation, it is far more likely
that your audience will be engaged. Never apologize for yourself. If
you start out by saying that your presentation isnt very good,
why would anyone want to listen to it? Everything about how you present
yourself will contribute to how well your presentation is received.
Dress professionally. And dont forget to smile!
Here are a few tips about delivery that you might find helpful.
- Make direct eye contact with members of your audience. Pick a person
and speak an entire phrase before shifting your gaze to another person.
Dont just scan the audience. Try not to look over
their heads or at the floor. Be sure to look at all parts of the room
at some point during the speech so everyone feels included.
- Speak loudly enough for people to hear and slowly enough for them
to follow what you are saying.
- Do not read your speech directly from your note cards or your paper.
Be sure you know your speech well enough to make eye contact with
your audience. Similarly, dont read your talk directly off of
transparencies.
- Avoid using distracting or repetitive hand gestures. Be careful
not to wave your manuscript around as you speak.
- Move around the front of the room if possible. On the other hand,
dont pace around so much that it becomes distracting. (If you
are speaking at a podium, you may not be able to move.)
- Keep technical language to a minimum. Explain any new vocabulary
carefully and provide a visual aide for people to use as a reference
if necessary.
- Be careful to avoid repetitive space-fillers and slang such as umm,
er, you know, etc. If you need to pause to
collect your thoughts, it is okay just to be silent for a moment.
(You should ask your practice audiences to monitor this habit and
let you know how you did).
- Leave time at the end of your speech so that the audience can ask
questions.
Displaying Your Results
When you create a visual display of your work, it is important to capture
and retain the attention of your audience. Entice people to come over
and look at your work. Once they are there, make them want to stay to
learn about what you have to tell them. There are a number of different
formats you may use in creating your visual display, but the underlying
principle is always the same: your work should be neat, well-organized,
informative, and easy to read.
It is unlikely that you will be able to present your entire project
on a single poster or display board. So, you will need to decide which
are the most important parts to include. Dont try to cram too
much onto the poster. If you do, it may look crowded and be hard to
read! The display should summarize your most important points and conclusions
and allow the reader to come away with a good understanding of what
you have done.
A good display board will have a catchy title that is easy to read
from a distance. Each section of your display should be easily identifiable.
You can create posters such as this by using headings and also by separating
parts visually. Titles and headings can be carefully hand-lettered or
created using a computer. It is very important to include lots of examples
on your display. It speeds up peoples understanding and makes
your presentation much more effective. The use of diagrams, charts,
and graphs also makes your presentation much more interesting to view.
Every diagram or chart should be clearly labeled. If you include photographs
or drawings, be sure to write captions that explain what the reader
is looking at.
In order to make your presentation look more appealing, you will probably
want to use some color. However, you must be careful that the color
does not become distracting. Avoid florescent colors, and avoid using
so many different colors that your display looks like a patch-work quilt.
You want your presentation to be eye-catching, but you also want it
to look professional.

People should be able to read your work easily, so use a reasonably
large font for your text. (14 point is a recommended minimum.) Avoid
writing in all-capitals because that is much harder to read than regular
text. It is also a good idea to limit the number of different fonts
you use on your display. Too many different fonts can make your poster
look disorganized.
Notice how each section on the sample poster is defined by the use
of a heading and how the various parts of the presentation are displayed
on white rectangles. (Some of the rectangles are blank, but they would
also have text or graphics on them in a real presentation.) Section
titles were made with pale green paper mounted on red paper to create
a boarder. Color was used in the diagrams to make them more eye-catching.
This poster would be suitable for hanging on a bulletin board.
If you are planning to use a poster, such as this, as a visual aid
during an oral presentation, you might consider backing your poster
with foam-core board or corrugated cardboard. A strong board will not
flop around while you are trying to show it to your audience. You can
also stand a stiff board on an easel or the tray of a classroom blackboard
or whiteboard so that your hands will be free during your talk. If you
use a poster as a display during an oral presentation, you will need
to make the text visible for your audience. You can create a hand-out
or you can make overhead transparencies of the important parts. If you
use overhead transparencies, be sure to use lettering that is large
enough to be read at a distance when the text is projected.

If you are preparing your display for a science fair, you will probably
want to use a presentation board that can be set up on a table. You
can buy a pre-made presentation board at an office supply or art store
or you can create one yourself using foam-core board. With a presentation
board, you can often use the space created by the sides of the board
by placing a copy of your report or other objects that you would like
people to be able to look at there. In the illustration, a black trapezoid
was cut out of foam-core board and placed on the table to make the entire
display look more unified. Although the text is not shown in the various
rectangles in this example, you will present your information in spaces
such as these.
Dont forget to put your name on your poster or display board.
And, dont forget to carefully proof-read your work. There should
be no spelling, grammatical or typing mistakes on your project. If your
display is not put together well, it may make people wonder about the
quality of the work you did on the rest of your project.
For more information about creating posters for science fair competitions,
see
http://school.discovery.com/sciencefaircentral/scifairstudio/handbook/display.html,
http://www.siemens-foundation.org/science/poster_guidelines.htm,
Robert Gervers book, Writing Math Research Papers, (published
by Key Curriculum Press) has an excellent section about doing oral presentations
and making posters, complete with many examples.
References Used
American Psychological Association. Electronic reference formats
recommended by the American Psychological Association.
(2000, August 22). Washington, DC: American Psychological Association.
Retrieved October 6, 2000, from the World Wide Web: http://www.apastyle.org/elecsource.html
Bridgewater State College. (1998, August 5). APA Style: Sample
Bibliographic Entries (4th ed). Bridgewater, MA: Clement C. Maxwell
Library. Retrieved December 20, 2001, from the World Wide Web:http://www.bridgew.edu/dept/maxwell/apa.htm
Crannell, Annalisa. (1994). A Guide to Writing in Mathematics
Classes. Franklin & Marshall College. Retrieved January 2,
2002, from the World Wide Web: http://www.fandm.edu/Departments/Mathematics/writing_in_math/guide.html
Gerver, Robert. 1997. Writing Math Research Papers.
Berkeley, CA: Key Curriculum Press.
Moncur, Michael. (1994-2002 ). The Quotations Page. Retrieved
April 9, 2002, from the World Wide Web: http://www.quotationspage.com/
Public Speaking -- Be the Best You Can Be. (2002). Landover,
Hills, MD: Advanced Public Speaking Institute. Retrieved April 9,
2002, from the World Wide Web: http://www.public-speaking.org/
Recreational Mathematics. (1988) Ottawa, Ontario, Canada:
Canadian Mathematical Society. Retrieved April 9, 2002, from the World
Wide Web: http://camel.math.ca/Recreation/
Shay, David. (1996). Profession Jokes Mathematicians.
Retrieved April 5, 2001, from the World Wide Web: http://www.geocities.com/CapeCanaveral/4661/projoke22.htm
Siemans Foundation. (2001). Judging Guidelines Poster.
Retrieved April 9, 2002, from the World Wide Web: http://www.siemens-foundation.org/science/poster_guidelines.htm,
VanCleave, Janice. (1997). Science Fair Handbook. Discovery.com.
Retrieved April 9, 2002, from the World Wide Web: http://school.discovery.com/sciencefaircentral/scifairstudio/handbook/display.html,
Woodward, Mark. (2000). The Mathematical Quotations Server.
Furman University. Greenville, SC. Retrieved April 9, 2002, from the
World Wide Web: http://math.furman.edu/~mwoodard/mquot.html
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