## Mathematicians Of The Day

### 7th January

On this day in 1610, Galileo first spotted that Jupiter had moons. By the 13th he had discovered four of them.

Click on Ⓟ for a poster.

##### Born:

- 1859: Georges Humbert Ⓟ
- 1871: Émile Borel Ⓟ
- 1904: Gordon Whyburn Ⓟ
- 1907: Raymond Paley Ⓟ
- 1922: Leopoldo Nachbin Ⓟ
- 1937: Evgenii Yakovlevich Khruslov Ⓟ

##### Died:

- 1893: Josef Stefan Ⓟ
- 1935: Ivan Vsevolodovich Meshchersky Ⓟ
- 1955: Edward Kasner Ⓟ
- 1974: Charles Coulson Ⓟ
- 1974: Philip Stein Ⓟ
- 1989: Frank Adams Ⓟ
- 1998: Richard Hamming Ⓟ
- 2010: Carlo Cercignani Ⓟ
- 2012: Herbert Wilf Ⓟ

#### Quotation of the day

##### From Émile Borel

The goal of geometry is to study those properties of bodies which can be considered independent of their matter, but only with respect their dimensions and forms. Geometry measures the surface of a field without bothering to find if the soil is good or bad.