Al-Karaji (953-about 1029), “regarded as the first person to free algebra from geometrical operations”, born 13 Apr http://t.co/aABEYxo7KO
— Maths History (@mathshistory) April 13, 2014
It is not of the essence of mathematics to be conversant with the ideas of number and quantity.
Born 2nd November 1815.
Please note that smoking (and duelling) can damage your health.
One of maths more tragic stories.
Seen at http://aperiodical.com/2012/10/happy-birthday-evariste-galois/
John von Neumann