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 membership relation for sets can often be replaced by the composition operation for functions. This leads to an alternative foundation for Mathematics upon categories -- specifically, on the category of all functions. Now much of Mathematics is dynamic, in that it deals with morphisms of an object into another object of the same kind. Such morphisms (like functions) form categories, and so the approach via categories fits well with the objective of organizing and understanding Mathematics. That, in truth, should be the goal of a proper philosophy of Mathematics.
Mathematics: Form and Function (New York 1986).