## Mathematicians Of The Day

### 23rd May

On this day in 1576, Tycho Brahe was given use of the island of Hven (now Ven in Sweden) for his astronomical observatory. He built two observatories: Uraniborg and Stjerneborg.

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##### Born:

- 1606: Juan Caramuel Ⓟ
- 1884: Corrado Gini Ⓟ
- 1886: Luigi Amoroso Ⓟ
- 1887: Thoralf Skolem Ⓟ
- 1901: John Williamson
- 1903: William Prager Ⓟ
- 1914: Lipman Bers Ⓟ
- 1917: Edward Lorenz Ⓟ
- 1928: Ioan James Ⓟ
- 1936: John Howie Ⓟ
- 1940: Cora Sadosky Ⓟ

##### Died:

- 1691: Adrien Auzout Ⓟ
- 1857: Augustin-Louis Cauchy Ⓟ
- 1885: Thomas Clausen Ⓟ
- 1889: George-Henri Halphen Ⓟ
- 1895: Franz Neumann Ⓟ
- 2005: Umirzak Sultangazin Ⓟ
- 2014: Bronius Grigelionis Ⓟ
- 2015: John F Nash Ⓟ

#### Quotation of the day

##### From Augustin-Louis Cauchy

√-1 we can repudiate completely and which we can abandon without regret because one does not know what this pretended sign signifies nor what sense one ought to attribute to it.