Jacques Hadamard
1865-1963
French mathematician who founded the branch of mathematics known as functional analysis, and developed a formula for determining the number of prime numbers.
The ancient Greeks had already proved that for every prime number there is a larger one. Using his work on the Riemann zeta function, Hadamard was able to demonstrate that the number of prime numbers less than x is asymptotically equal to x/log x. He made many other fundamental contributions to mathematics and published a book entitled The Psychology of Invention in the Mathematical Field.
This is the complete article, containing 89 words
(approx. 1 page at 300 words per page).
