## Mathematicians Of The Day

### 22nd October

On this day in 1685, Louis XIV revoked the

*Edict of Nantes*which led to many Huguenot Protestants leaving France. Among mathematicians affected were Abraham de Moivre, Albert Girard, Joseph Saurin, Denis Papin and Francis Maseres.
Click on Ⓟ for a poster.

##### Born:

- 1511: Erasmus Reinhold Ⓟ
- 1587: Joachim Jungius Ⓟ
- 1843: John S Mackay Ⓟ
- 1878: Beulah Russell Ⓟ
- 1893: Ernst Öpik Ⓟ
- 1895: Rolf Nevanlinna Ⓟ
- 1898: Marguerite Lehr Ⓟ
- 1907: Sarvadaman Chowla Ⓟ
- 1914: Jacques Feldbau Ⓟ
- 1916: Nathan Fine Ⓟ
- 1921: Alexander Kronrod Ⓟ
- 1927: Alexander Ivanovich Skopin Ⓟ

##### Died:

- 1950: Isabel Maddison Ⓟ
- 1977: Beniamino Segre Ⓟ
- 1979: Reinhold Baer Ⓟ

#### Quotation of the day

##### From Reinhold Baer

The main result of Gödel's paper ... can be formulated in a pointed and, hence not fully correct way as follows:

If A is a countable, consistent logical system, for example arithmetic, then there is a proposition in A which is not decidable in A (but may be decidable in extended systems).

Hurrah, logicians have also discovered diagonalisation!