## Mathematicians Of The Day

### 14th April

On this day in 1855, Sam Loyd's first chess problem was published in the

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

*New York Saturday Courier*.On this day in 2005 Google released a Leonardo doodle (a day early).

Click on Ⓟ for a poster.

##### Born:

- 1629: Christiaan Huygens Ⓟ
- 1868: Annie Scott Dill Maunder Ⓟ
- 1917: Nathan Mendelsohn Ⓟ
- 1920: Donald Pack Ⓟ
- 1935: Victor Olunloyo Ⓟ
- 1937: Charles Sims Ⓟ

##### Died:

- 1833: Charles Whish
- 1935: Emmy Noether Ⓟ
- 1948: Clara Bacon Ⓟ
- 1957: Walter Brown
- 1964: Tatiana Alexeyevna Afanassjewa Ⓟ
- 1983: Errett Bishop Ⓟ
- 2005: Saunders Mac Lane Ⓟ
- 2015: Gordon Preston Ⓟ

#### 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.