MacTutor
Mathematicians Of The Day
21st June
On this day in 1976, Kenneth Appel and Wolfgang Haken announced that they had proved the four colour conjecture with the aid of a computer. No simple proof is known as yet.
See THIS LINK.
A (personally designed) stamp of one of today's mathematicians is at THIS LINK.
See THIS LINK.
A (personally designed) stamp of one of today's mathematicians is at THIS LINK.
Click on Ⓟ for a poster.
Born:
- 1781: Siméon-Denis Poisson Ⓟ
- 1802: Jean-Baptiste Brasseur Ⓟ
- 1828: Giuseppe Bruno
- 1868: James Macdonald
- 1872: Onorato Nicoletti Ⓟ
- 1894: Harry Schmidt Ⓟ
- 1918: Tibor Szele Ⓟ
- 1928: Chukwuka Okonjo Ⓟ
- 1954: Pavel Krejčí Ⓟ
- 1964: Haim Nessyahu Ⓟ
Died:
- 1820: Alexis Petit Ⓟ
- 1824: Nicola Fergola Ⓟ
- 1913: Gaston Tarry Ⓟ
- 1929: Ferdinand Rudio Ⓟ
- 1940: Wolfgang Doeblin Ⓟ
- 1947: Nikolai Sergeevitch Krylov Ⓟ
- 1948: D'Arcy Thompson Ⓟ
- 1957: Maurice Audin Ⓟ
- 1999: Edwin Hewitt Ⓟ
- 2007: Jack Todd Ⓟ
- 2017: Jean-Pierre Kahane Ⓟ
Quotation of the day
From D'Arcy Thompson
We call a thing big or little with reference to what it is wont to be, as we speak of a small elephant or a big rat.
