Jacques Hadamard

lived from 1865 to 1963

Jacques Hadamard was a French mathematician whose most important result is the prime number theorem which he proved in 1896. This states that the number of primes < n tends to infinity as fast as n/log e n.

Find out more at:
http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Hadamard.html