20th February
On this day in 1648, a letter from Pierre de Fermat through Frenicle de Bessy to Kenelm Digby reached John Wallis saying that Fermat had solved equations of the type for all non-square values up to 150. Thus begins the saga of the mis-naming of Pell's equation.
The postage stamp of one of today's mathematicians at THIS LINK was issued in 1981.
The postage stamp of one of today's mathematicians at THIS LINK was issued in 1981.