## Mathematicians Of The Day

### 31st August

On this day in 1682, Michael Rolle published an elegant solution to a difficult problem publicly posed by Ozanam:

This brought him public recognition.

*Find four integers the difference of any two of which is a perfect square as well as the sum of the first three will be a perfect square.*This brought him public recognition.

Click on Ⓟ for a poster.

##### Born:

- 1821: Hermann von Helmholtz Ⓟ
- 1831: Georg Sidler Ⓟ
- 1848: Emil Weyr Ⓟ
- 1864: Robert Hardie
- 1880: Heinrich Tietze Ⓟ
- 1885: Herbert Turnbull Ⓟ

##### Died:

- 1721: John Keill
- 1811: Louis-Antoine de Bougainville Ⓟ
- 1918: Andre-Louis Cholesky Ⓟ
- 1940: John Pullar
- 1945: Stefan Banach Ⓟ
- 1946: Leslie Cunningham
- 1975: Evgeny Remez Ⓟ
- 1980: Rafael Laguardia Ⓟ
- 2010: Nigel Kalton Ⓟ

#### Quotation of the day

##### From Herbert Turnbull

The usefulness of mathematics in furthering the sciences is commonly acknowledged: but outside the ranks of the experts there is little enquiry into its nature and purpose as a deliberate human activity.