Great conference on a rainy Saturday

I brought my knot theory students to our regional meeting of the MAA today (the EPaDel section). It was one of the best EPaDel meetings I’ve attended. There were parallel talks, so it was hard to decide who to see. I decided to watch the student talks in the morning and the invited talks in…

Is this the Cayley table of a group? (Part 2)

In my previous post I posed the following question: suppose you are given a table for a binary operation such that there is a two-sided identity, every element has a two-sided inverse, and the table is a Latin square (that is, each symbol occurs exactly once in each row and each column). Is it the Cayley table of a…

Math on a bridge

God Plays Dice posted a link to a photo of some mathematics displayed prominently on a bridge. (No not that bridge.) Below is the photograph of the mean value theorem on a bridge in Beijing. Does anyone know the story behind this? [photo by Vmenkov published under the Creative Commons Attribution ShareAlike 3.0 License]