Mathematicians Of The Day

14th April

On this day in 1855, Sam Loyd's first chess problem was published in the New York Saturday Courier.

On this day in 2005 Google released a Leonardo doodle (a day early).

Click on for a poster.

Quotation of the day

From Saunders Mac Lane
The standard "foundation" for mathematics starts with sets and their elements. It is possible to start differently, by axiomatising not elements of sets but functions between sets. This can be done by using the language of categories and universal constructions.