## Mathematicians Of The Day

### 19th April

On this day in 1760, Euler wrote the first of 263 letters to Princess Charlotte Ludovica Luisa, later collected as

*Letters to a German Princess*. In the first letter Euler promised to produce:-... examples of the smallest as well as the greatest extensions of matter actually discoverable in the system of the universe.

Click on Ⓟ for a poster.

##### Born:

- 1748: Charles Tinseau
- 1846: Henry Heaton Ⓟ
- 1858: George Gibson Ⓟ
- 1880: Evgeny Evgenievich Slutsky Ⓟ
- 1883: Richard von Mises Ⓟ
- 1885: Leonida Tonelli Ⓟ
- 1901: Kiyoshi Oka Ⓟ
- 1905: Charles Ehresmann Ⓟ
- 1909: Hugh Alexander Ⓟ
- 1923: Adegoke Olubummo Ⓟ

##### Died:

- 1567: Michael Stifel Ⓟ
- 1739: Nicholas Saunderson Ⓟ
- 1791: Richard Price Ⓟ
- 1881: Karl Peterson Ⓟ
- 1914: Charles S Peirce Ⓟ
- 1933: Ernest Hobson Ⓟ
- 1974: Alexander Dinghas Ⓟ
- 2013: Kenneth Appel Ⓟ

#### Quotation of the day

##### From Charles S Peirce

The one [the logician] studies the science of drawing conclusions, the other [the mathematician] the science which draws necessary conclusions.