## Mathematicians Of The Day

### 16th April

On this day in 1673, Leibniz wrote to Oldenburg about series:-

I conjecture that Mr Collins himself does not speak of these summations of infinite series because he brings forward the example of the series $\large\frac 1 2\normalsize, \large\frac 1 3\normalsize, \large\frac 1 4\normalsize, \large\frac 1 5\normalsize, \large\frac 1 6\normalsize, ...$ which if it is continued to infinity cannot be summed because the sum is not finite, like the sum of the triangular numbers, but infinite. But now I am cramped by the space of my paper.On this day in 2009 Google released a Huygens doodle (two days late).

Click on Ⓟ for a poster.

##### Born:

- 1495: Petrus Apianus Ⓟ
- 1682: John Hadley Ⓟ
- 1706: Benjamin Robins Ⓟ
- 1800: Humphrey Lloyd Ⓟ
- 1820: Victor Puiseux Ⓟ
- 1823: Gotthold Eisenstein Ⓟ
- 1873: Alfred Young Ⓟ
- 1885: Karel Rychlik Ⓟ
- 1891: Jenő Egerváry Ⓟ
- 1894: Jerzy Neyman Ⓟ
- 1898: Hellmuth Kneser Ⓟ

##### Died:

- 1788: Georges Buffon Ⓟ
- 1914: George Hill Ⓟ
- 1919: Paul Mansion Ⓟ
- 1956: Hermann Ludwig Schmid Ⓟ
- 1998: Alberto Calderón Ⓟ
- 2008: Edward Lorenz Ⓟ

#### Quotation of the day

##### From Georges Buffon

Never think that God's delays are God's denials. Hold on; hold fast; hold out. Patience is genius.