## Mathematicians Of The Day

### 22nd July

On this day in 1680, Ehrenfried Walter von Tschirnhaus was elected to the Paris Académie des Sciences.

Click on Ⓟ for a poster.

##### Born:

- 1755: Gaspard de Prony Ⓟ
- 1784: Wilhelm Bessel Ⓟ
- 1795: Gabriel Lamé Ⓟ
- 1861: Ernst Fiedler Ⓟ
- 1872: Alexander Durie Russell Ⓟ
- 1882: Konrad Knopp Ⓟ
- 1887: Gustav Hertz Ⓟ
- 1902: Reinhold Baer Ⓟ
- 1904: Donald Eperson Ⓟ
- 1907: Edgar Raymond Lorch Ⓟ
- 1926: John Aitchison Ⓟ
- 1930: Shreeram Shankar Abhyankar Ⓟ
- 1935: John Stallings Ⓟ
- 1948: Chandra Kintala Ⓟ

##### Died:

- 1575: Francesco Maurolico Ⓟ
- 1826: Giuseppe Piazzi Ⓟ
- 1943: William Osgood Ⓟ
- 1950: Vyacheslaw Vassilievich Stepanov Ⓟ
- 1959: David van Dantzig Ⓟ
- 1995: Otakar Boruvka Ⓟ

#### Quotation of the day

##### From David van Dantzig

The attempt to apply rational arithmetic to a problem in geometry resulted in the first crisis in the history of mathematics. The two relatively simple problems -- the determination of the diagonal of a square and that of the circumference of a circle -- revealed the existence of new mathematical beings for which no place could be found within the rational domain.