Who was the greatest mathematician of the 20th century?

The century began with a historic convention at the Sorbonne in Paris in the summer of 1900 which is largely remembered for a lecture by the young German mathematician David Hilbert in which he set out what he saw as the 23 greatest unsolved mathematical problems of the day. read more

The 20th century was a peak time for math, and picking a single greatest mathematician is a fool’s errand. Nevertheless, I have some favorites. In terms of influence, Turing and Church invented computer science before there were computers and made their invention necessary. read more