Mathematicians Of The Day

29th October

On this day in 1675, the integral symbol was first used by Gottfried Leibniz in an unpublished manuscript, Analyseos tetragonisticae pars secunda [Second part of analytical quadrature].

Click on for a poster.

Quotation of the day

From Jean d'Alembert
Allez en avant, et la foi vous viendra
Push on and faith will catch up with you.
[advice to those who questioned the calculus]
Quoted in A L Mackay, Dictionary of Scientific Quotations (London 1994)