## Mathematicians Of The Day

### 22nd April

Click on Ⓟ for a poster.

##### Born:

- 1592: Wilhelm Schickard Ⓟ
- 1811: Otto Hesse Ⓟ
- 1830: Thomas Hirst Ⓟ
- 1861: Emil MÃ¼ller
- 1884: David Enskog Ⓟ
- 1887: Harald Bohr Ⓟ
- 1891: Harold Jeffreys Ⓟ
- 1903: Taro Morishima Ⓟ
- 1910: Norman Steenrod Ⓟ
- 1929: Michael Atiyah Ⓟ
- 1933: John Frankland Rigby Ⓟ
- 1934: Ene-Margit Tiit Ⓟ
- 1935: Bhama Srinivasan Ⓟ
- 1946: Paul Davies Ⓟ

##### Died:

- 1945: Wilhelm Cauer Ⓟ
- 1945: Jacques Feldbau Ⓟ
- 1948: Herbert Richmond Ⓟ
- 2008: Tom Whiteside Ⓟ

#### Quotation of the day

##### From Michael Atiyah

I think it is said that Gauss had ten different proofs for the law of quadratic reciprocity. Any good theorem should have several proofs, the more the better. For two reasons: usually, different proofs have different strengths and weaknesses, and they generalise in different directions -- they are not just repetitions of each other.