## Mathematicians Of The Day

### 3rd January

On this day in 1657, Pierre de Fermat made a challenge to the mathematicians of Europe and England. He posed two problems, involving

1. Find a cube

2. Find a square

Frenicle de Bessy found solutions to these on the day he was given the problems.

*S*(*n*), the sum of the proper divisors of*n*:1. Find a cube

*n*such that*n*+*S*(*n*) is a square.2. Find a square

*n*such that*n*+*S*(*n*) is a cube.Frenicle de Bessy found solutions to these on the day he was given the problems.

Click on Ⓟ for a poster.

##### Born:

- 1777: Louis Poinsot Ⓟ
- 1788: Enno Heeren Dirksen Ⓟ
- 1912: Cora Ratto de Sadosky Ⓟ
- 1917: Yurii Alekseevich Mitropolskii Ⓟ
- 1921: Jean-Louis Koszul Ⓟ
- 1924: Clive William Kilmister Ⓟ
- 1926: David Spence Ⓟ

##### Died:

- 1641: Jeremiah Horrocks Ⓟ
- 1891: John Casey Ⓟ
- 1892: Heinrich Schröter Ⓟ
- 1912: Jacob Amsler Ⓟ
- 1920: Zygmunt Janiszewski Ⓟ
- 1927: Carl Runge Ⓟ
- 1960: Georges Darmois Ⓟ
- 1989: Sergei Sobolev Ⓟ
- 2004: José Escobar
- 2011: Anatolii Volodymyrovych Skorokhod Ⓟ

#### Quotation of the day

##### From Louis Poinsot

Everyone makes for himself a clear idea of the motion of apoint, that is to say, of the motion of a corpuscle which one supposes to be infinitely small, and which one reduces by thought in some way to a mathematical point.