What is the name of the 23 mathematical problems presented in 1900 in Paris, France?
German mathematician David Hilbert presented ten of the problems at the Paris conference of the International Congress of Mathematicians. The complete list was published later. They were all unsolved at the time, and several of them were very influential for 20th-century mathematics. Now most of them have solutions, leaving 3 unsolved and 2 more categorized as too vague to ever be described as solved.