Browse by Set

Explore famous collections and compilations of unsolved problems

Seven problems selected by the Clay Mathematics Institute in 2000, each with a $1,000,000 prize for solution.

David Hilbert's list of 23 unsolved problems presented at the International Congress of Mathematicians in Paris in 1900.

A collection of 100 open problems in additive combinatorics and related areas, compiled by Ben Green.

Mathematical challenges identified by DARPA to drive fundamental research in mathematics.

Steve Smale's list of mathematical problems for the 21st century.

Four basic problems about prime numbers posed by Edmund Landau at the 1912 International Congress of Mathematicians.