What are some great math social activities for students? I'm looking for things that bring people together with a "light" mathematical touch. The goal is to create a stronger mathematical community in a small college math department.
Examples I've heard so far:
Math Stack Exchange Party: Students get together and surf questions on this site and answer them.
Zome Tool Party: Students get together and make cool things out of Zome tools.
Integration Bee: Spelling bee….but with integrals!
I'm looking for "soft" ways to attract students to the major. Thanks, in advance!
Best Answer
When I was a first year undergrad, we organised a mathematical Call My Bluff evening. A game master prepares questions in the vein of "What is a happy number?", "State one interesting theorem from Ramsey theory", and so on, questions whose answers a first year undergraduate is unlikely to know but likely to understand. Then, several teams have to invent credible answers and quietly submit them on a piece of paper. The game master reads them all out, along with the correct answer and the teams have to guess which answer is right. There are some points for identifying the right answer, but even more points for every team that fell for yours.
It's great fun, and actually quite demanding: when you invent a definition, you must take care not to define the empty set and not to define something that you already know under a different name. Accordingly, when you are evaluating the answers, you are trying to rule out those that seem to define/state something boring or something well-known under a different name. Of course, inventing answers is also very creative and makes you realise how difficult it is to ask interesting questions or introduce interesting concepts.