Browse by topic
372 results, grouped by what they are about, how long the question was open, how important they are and how far you can trust them.
Topics and problem families
Erdős problems Topic · 13 results Named conjectures Topic · 85 results Ramsey theory Topic · 5 results Prime numbers Topic · 12 results Graph theory Topic · 40 results Distances and packing Topic · 5 results Curvature and geometric flows Topic · 17 results Eigenvalues and spectral theory Topic · 8 results Elliptic curves and abelian varieties Topic · 7 results Quantum theory Topic · 9 results
How long the question was open
Open since before 1940 Era · 16 results Open since the 1940s Era · 12 results Open since the 1950s Era · 23 results Open since the 1960s Era · 33 results Open since the 1970s Era · 63 results Open since the 1980s Era · 60 results Open since the 1990s Era · 55 results Open since the 2000s Era · 48 results Open since the 2010s Era · 31 results Open since the 2020s Era · 9 results
Significance
Trust label
Fields of mathematics
Theoretical computer science Field · 40 results Combinatorics Field · 37 results Algebraic and complex geometry Field · 36 results Number theory Field · 31 results Probability and statistical mechanics Field · 29 results Differential geometry Field · 29 results Mathematical physics Field · 25 results Operator algebras Field · 19 results Algebra Field · 18 results Topology Field · 18 results Real and complex analysis Field · 16 results Partial differential equations Field · 16 results Convex and metric geometry Field · 15 results Group theory Field · 14 results Dynamical systems and ergodic theory Field · 12 results Functional analysis Field · 11 results Mathematical logic Field · 6 results