## Mathematicians Of The Day

### 9th December

On this day in 1911 Henri PoincarĂ© wrote the editor of a mathematical journal to ask if, contrary to custom, an unfinished piece of work could be published. He explained that at his age he might not be able to finish it, but that his work might provide ideas for another. The paper was published and not long afterwards George Birkhoff completed the solution. PoincarĂ© died the following year.

On this day in 2013 Google released a Hopper doodle

The postage stamp of one of today's mathematicians at THIS LINK was issued in 2000.

On this day in 2013 Google released a Hopper doodle

The postage stamp of one of today's mathematicians at THIS LINK was issued in 2000.

Click on Ⓟ for a poster.

##### Born:

- 1667: William Whiston Ⓟ
- 1839: Gustav Roch Ⓟ
- 1883: Nikolai Luzin Ⓟ
- 1883: Aleksandr Nekrasov Ⓟ
- 1895: Lancelot Hogben Ⓟ
- 1902: Hans Schwerdtfeger Ⓟ
- 1905: Emanuel Sperner Ⓟ
- 1906: Grace Hopper Ⓟ
- 1907: Max Deuring Ⓟ
- 1916: Irving John Good Ⓟ
- 1917: Sergei Fomin Ⓟ

##### Died:

- 1880: Oliver Byrne Ⓟ
- 1882: Li Shanlan Ⓟ
- 1938: James Pierpont
- 1949: Rolin Wavre Ⓟ
- 1958: John Jackson Ⓟ
- 2012: Vitaly Vitalievich Fedorchuk Ⓟ

#### Quotation of the day

##### From Nikolai Luzin

It seems the set of natural numbers is not an absolutely objective formation. It seems it is a function of the mind of the mathematician who happens to be speaking of a set of natural numbers at a given moment. It seems there are, among the problems of arithmetic, those that absolutely cannot be solved.