## Mathematicians Of The Day

### 22nd November

Click on Ⓟ for a poster.

##### Born:

- 1753: Dugald Stewart Ⓟ
- 1803: Giusto Bellavitis Ⓟ
- 1837: Hermann Bleuler Ⓟ
- 1840: Émile Lemoine Ⓟ
- 1875: Louis N G Filon Ⓟ
- 1909: Ottó Varga Ⓟ
- 1910: Floyd Burton Jones Ⓟ

##### Died:

- 1784: Paolo Frisi Ⓟ
- 1930: Peter Pinkerton Ⓟ
- 1944: Arthur Eddington Ⓟ
- 1986: Nikolai Grigor'evich Chudakov Ⓟ
- 1996: Garrett Birkhoff Ⓟ
- 2001: Luís Antoni Santaló Ⓟ
- 2007: Ronald Mitchell Ⓟ

#### Quotation of the day

##### From Arthur Eddington

To the pure geometer the radius of curvature is an incidental characteristic - like the grin of the Cheshire cat. To the physicist it is an indispensable characteristic. It would be going too far to say that to the physicist the cat is merely incidental to the grin. Physics is concerned with interrelatedness such as the interrelatedness of cats and grins. In this case the "cat without a grin" and the "grin without a cat" are equally set aside as purely mathematical phantasies.