UnsolvedMath

UnsolvedMath

A curated repository of open mathematics problems across all domains

Explore 2,084 open questions in mathematics, featuring Erdős problems, Kirby's low-dimensional topology list, Kourovka Notebook problems, Hilbert's 23, Smale's 18, DARPA's 23 challenges, Ben Green's 100 problems, and more.

Browse ProblemsExplore Categories

New in v1.1

150 problems

Kourovka Notebook - New Problems, Issue 21

New group theory problems from the 21st issue of the Kourovka Notebook, published in 2026.

366 problems

Kirby's Problems in Low-Dimensional Topology

Problems from Kirby-style notes on low-dimensional topology, including knot theory, 3-manifolds, 4-manifolds, and related invariants.

422 problems

OpenGarden

Problems imported from the Open Problem Garden collection, using source statements, discussion notes, and subject metadata.

Activity / Forum

Moderated problem discussions are now enabled

Users can post comments on problem pages, and recent approved posts appear in the Activity feed.

L1
Tractable
L2
Intermediate
L3
Advanced
L4
Expert
L5
Millennium

Features

  • ✓Curated collection of unsolved problems from all mathematical domains
  • ✓Difficulty levels from tractable (L1) to Millennium Prize problems (L5)
  • ✓LaTeX support for precise mathematical notation
  • ✓Moderated discussions to ensure high-quality mathematical discourse
  • ✓Cross-references to related problems and research papers

Recent Activity

View all