- We have a weekly problem solving dinner at 5:30pm in Dennett Private Dining Room at Mission on Wednesdays. There’s no prep work; feel free to drop in any time (and if you’re not on the meal plan we’ll provide a swipe). The way it works is we print out a math competition from somewhere in the world, and then brainstorm and attack the problems together.
- We’ll also meet for lunch on Wednesdays (in Mission at noon, room TBD) to do Project Euler problems.
- There are several math competitions each year. Some time in October or November we’ll defend the Green Chicken when Middlebury travels here. There’s also the Virginia Tech math competition (we’ll do this remotely Saturday October 25th), and the Putnam exam (which will probably be Sat Dec 6th).
- We also frequently field teams for the Mathematical Contest in Modeling.
- I’m also teaching a class on math puzzles and problem solving, Math 331: The little Questions. Feel free to check out the homepage for resources, as well as lectures (each class is recorded and uploaded to YouTube).

Many people love math puzzles or riddles. They’re often fun, frequently illustrate a beautiful concept or perspective, and unlike real world research problems they typically have an elegant answer. Below is one of my favorites. It can be solved by brute force but only at great cost (and a high probability of forgetting a case); however, if you look at it the right way it’s just one line (and this proper perspective illustrates a powerful technique which is of use in research mathematics).

**Problem: Imagine you have 10 distinct cookies but 5 distinguishable, hungry graduate students (so they’re not engineering students working away in a lab!). How many ways can you divide all the cookies among the people? In other words, we only care about how many cookies each person gets, not which ones.**

I run a math riddles page (see http://mathriddles.williams.edu/ ), and this was the first problem I added; the problems and resources posted there for students and teachers are used in schools throughout the world, and if you’re interested in helping with the site drop me a line at sjm1@williams.edu. It turns out that this problem is equivalent to Waring’s Problem with exponent 1; I’ve used this idea with SMALL students in research problems related to Fibonacci numbers (this is discussed in another post, To Bead or Not To Bead). Enjoy!

]]>One of the things I’ve missed most about the US and about Williams especially is the involvement that undergraduates have with the broader math community. Giving a senior colloquium, doing original research, or presenting at a conference are all essentially unheard of at the undergraduate level in the UK. For that reason, I decided to organize a conference at which both Williams and Exeter college students could present mathematics.

The event was a huge success. Thanks to a generous contribution from the John and Louise Finnerty fund, we were able to purchase food, coffee, and bus tickets for conference participants. About half of the WEPO students attended. This included every math major in the WEPO program, but even more Williams students majoring in other disciplines! Four Oxford students attended, including a few very enthusiastic first year maths students and a second year physicist. Everyone who attended stayed for at least 4 of the 5 talks. These talks were given by

Jesse Freeman

Jesse Liu (2nd year physicist, Exeter college)

Isaac Loh

Christopher Huffaker

Elliot Chester

I would like to extend a special thank you to John and Louise Finnerty, Professor Katie Kent, Exeter College Rector Frances Cairncross, Exeter College Sub-Rector Jeri Johnson, Professor Steven Miller, and the Williams math department for their invaluable support in organizing this event.

Here are some pictures from the event, the Exeter College Quarrel Room, refreshments, and the presentations:

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ROSENBURG PRIZE for excellent senior: **Ilya Amburg **and** Vu Le.**

GOLDBERG AWARD for best colloquium:

**Nina Horowitz** “The Mathematics Behind Playing Hard to Get“

**Joseph Iafrate** “Random Walk, Random Strikeout: Baseball as a Markov Chain”

WYSKIEL AWARD in Teaching: **Jeff Brewington**

MORGAN PRIZE in Applied Math: **Carson Eisenach**

MORGAN PRIZE in Teaching: **David Stevens**

ROBERT M. KOZELKA AWARD in Statistics: **Faraz Rahman**

OLGA R. BEAVER PRIZE for department service: **David Stevens**

BENEDICT PRIZE for outstanding sophomore:

1^{st} prize: **Peter McDonald**

2^{nd} prize: **Eva Fourakis and Elizabeth Frank**

WITTE PROBLEM-SOLVING PRIZE: **Samuel Donow, ****Jared Hallett, Benjamin Kaufman**

COLLOQUIUM ATTENDANCE: **Michael Gold ’14, John Bihn ’16**

Prof. Johnson thanked visitors Michael Biro, Holley Friedlander, and Ed Hanson, and recognized SMASAB, the student math advisory board:

Craig Corsi, Philippe Demontigny, Jared Hallet, Caroline Miller, Faraz Rahman, Jiripat Samranvedhya, David Stevens, Kirk Swanson, Sam Tripp, Carrie Chu, Jesse Freeman, Joe Kinney, Anna Spiers, Phonkrit Tanavisarut, Jaclyn Porfilio.

Following tradition, seniors gave advice, for example:

Michael Gold: “Go to office hours.”

Ilya Amburg: “Do a thesis.”

Sam Austin: “Work with friends, if you have any.”

Alex Albright: “If you think you understand something, try explaining it to someone.”

Caroline Miller: “If you want to stump a job interviewer, start talking about research.”

David Stevens: “Be promiscuous, mathematically speaking, because you never know what you’ll like until you fool around.”

Heidi Chen: “Learn LaTeX.”

Matt Micheli: “Try not to overuse your beverage wrench.”

Gabor Gurbacs: “Work on an unsolved problem in math and never give up.”

The banquet was supported in part by the John and Louise Finnerty Class of 1971 Fund.

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The Golden Ratio and the Fibonacci Sequence by **Megumi Asada**

Benford’s Law and the Fibonacci Numbers by **John Bihn**

Isoperimetric Regions in the Plane and Beyond by **Wyatt Boyer**

Limit of Sequence in non-Hausdorff Space by **Yuanchu Dang**

Generalizations of the Vector Cross Product by **Edward Hanson**

The Convex Body Isoperimetric Conjecture by **Frank Morgan**

A Proof of the Arrow’s Impossibility Theorem by **Jeffrey Wang**

1. Mathematician.

2. Tenured professor.

3. Statistician.

4. Actuary.

(The worst was lumberjack.)

]]>Williams News Release on Burger as Southwestern President.

Here are pictures of President Burger at Convocation and helping Southwestern students move in:

Burger’s book with Starbird on “The 5 Elements of Successful Thinking” has been named 2013 Silver Medal Winner in the Independent Publisher Book Awards, Self-Help category.

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Mathematics has got to be the most interesting of all subjects. As I was telling the wonderful math faculty at Berkshire Community College, even arithmetic is fascinating. Addition and multiplication are commutative: 4+7=7+4 and 4×7=7×4. I recall MIT Professor Michael Artin saying:

When I ask my kids what’s 4×7, they answer “28.”

7×4? “28.”

4+7? “11.”

7+4? “You already asked us that.”

Commutativity of multiplication is true, but commutativity of addition is obvious. Later on those youngsters will find that for matrices, addition remains commutative but multiplication does not.

“Now if you could only make fractions interesting,” the math faculty responded.

]]>Once again, Pi Day has arrived!

As you probably know, pi (π) is a mathematical constant found in circles and throughout mathematics! Since pi’s decimal expansion starts off 3.14…, and today’s date is 3/14, we celebrate pi and all things mathematical on this day!

3.141592653589793238462643383279…, to be a bit more precise! Image copyright David Reimannn.

**MY TOP PI WAYS TO CELEBRATE PI DAY**

1. Share pi (and pie) with friends

2. Read and learn more about pi

3. Contemplate the wonder of the universe and mathematics’ role within it

.14159…. Shout “Happy Pi Day!” and/or “Happy Pi Moment” at the top of your lungs when the appropriate time occurs

Art from pi’s digits, copyright Martin Krzywinski.

**PIECES OF PI**

Related to #1 and #2 above, here are a few cool tidbits about pi and pi day:

A piem, that is, a poem where the number of letters in each word yields the sequence of pi’s digits. Though I’ve discussed several of these before (most notably, *Poe, E. Near a Raven*), I had not run across this century-old piem before this week!

A statistical analysis on the probability of writing piems or other pilish phrases by accident!

If you’re a fan of mathematical art, check out this Numberphile video explaining some of the art I’ve featured in today’s post, and also this gallery of mathy art from this winter’s Joint Mathematics Meetings in Baltimore!

Challenge yourself with some pi puzzles from Brainfreeze!

Some other ways to celebrate can be found in my (Pi Day – 2) post here.

More pi artwork, copyright Cristian Ilies Vasile / Martin Krzywinski.

**PI PAST**

I cannot believe it’s been 10 years since my first pi day expansive email that set up (or continued) a crazy propaganda war between the mathematical constants pi and e. (Going back even further, by my count I’ve been celebrating pi day in some form or another for almost 18 years now!) Just about each year since 2004 I have sent out my annual missive on Pi Day, by email and/or by blog (a few years when March was especially busy for me, I sent out messages on other pi-related days). A list can be found in yesterday’s pre-pi-day post here.

One more, also copyright Cristian Ilies Vasile / Martin Krzywinski

Have a great Pi Day today, and many more!

Nick

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