Mathematicians Of The Day: 28th September

On this day in 1695, after fitting several comets data using Newton's proposal that they followed parabolic paths, Edmund Halley tested his own measurements of the 1682 comet against an elliptical orbit. He wrote to Newton,

I am more and more confirmed that we have seen that Comet now three times since the year 1531.The postage stamp of one of today's mathematicians at THIS LINK was issued in 1986.

Click on Ⓟ for a poster.

Born:

1605: Ismael Boulliau Ⓟ

1698: Pierre-Louis Moreau de Maupertuis Ⓟ

1761: François Budan

1824: George Allman Ⓟ

1833: Henri Delannoy Ⓟ

1873: Julian Coolidge Ⓟ

1881: Edward Ross

1893: Hilda Geiringer Ⓟ

1901: Kurt Friedrichs Ⓟ

1925: Martin Kruskal Ⓟ

1938: Hideo Tanaka Ⓟ

Died:

1667: Jacob Gool Ⓟ

1694: Gabriel Mouton Ⓟ

1869: Guglielmo Libri Ⓟ

1928: Pierre Puiseux Ⓟ

1949: Karl Sundman Ⓟ

1953: Edwin Hubble Ⓟ

1967: Stanisław Knapowski Ⓟ

1992: John Leech Ⓟ

1998: Anzelm Iwanik Ⓟ

2004: Jack van Lint Ⓟ