Mathematicians Of The Day: 20th August

On this day in 1638 William Oughtred wrote about his slide rule invention to the instument maker Elias Allen:-

I have here sent you directions (as you requested me being at Twickenham) about the making of the two rulers. ... would gladly see one of [the two parts of the instrument] when it is finished: which yet I never have done.

Click on Ⓟ for a poster.

Born:

1645: Siguenza y Gongora Ⓟ

1710: Thomas Simpson Ⓟ

1862: Paul Stäckel Ⓟ

1863: Corrado Segre Ⓟ

1892: Octav Onicescu Ⓟ

1898: Leopold Infeld Ⓟ

1899: Salomon Bochner Ⓟ

1901: Steven Vajda Ⓟ

1905: Anna Adelaide Stafford Henriques Ⓟ

1923: Tom Apostol Ⓟ

1925: Elza Furtado Gomide Ⓟ

1928: Charles Bell Ⓟ

1957: Simon Donaldson Ⓟ

Died:

1672: Jan de Witt Ⓟ

1677: Pierre Petit

1950: George Carse Ⓟ

1972: Carol Karp Ⓟ

2001: Fred Hoyle Ⓟ

2006: William Parry Ⓟ

2014: Bryce McLeod Ⓟ