Solved Problems
- (0,1)-Matrix
- Abhyankar's Conjecture
- Acyclic Digraph
- Alternating Sign Matrix Conjecture
- Aperiodic Monotile
- Aperiodic Tiling
- Archimedes' Cattle Problem
- Baudet's Conjecture
- Bellows Conjecture
- Bennequin's Conjecture
- Bieberbach Conjecture
- Bimagic Square
- Blaschke Conjecture
- Burnside's Conjecture
- Busemann-Petty Problem
- Carmichael's Conjecture
- Catalan's Conjecture
- Central Binomial Coefficient
- Checkers
- Conway's Knot
- Cube Line Picking
- Digit
- Dodecahedral Conjecture
- Double Bubble
- Dyson's Conjecture
- Einstein
- Einstein Hat
- Einstein Tile
- Epsilon Conjecture
- Erdős-Heilbronn Conjecture
- Erdős Squarefree Conjecture
- Eternity
- Fermat's Last Theorem
- Flyping Conjecture
- Four-Color Problem
- Four-Color Theorem
- FoxTrot Series
- Gauss's Class Number Conjecture
- Gelfond's Theorem
- Goldbach Conjecture
- Green-Tao Theorem
- Haberdasher's Problem
- Hadjicostas's Formula
- Heawood Conjecture
- Hilbert's Problems
- Hofstadter-Conway $10,000 Sequence
- Honeycomb Conjecture
- Hundred-Dollar, Hundred-Digit Challenge Problems
- Jevons' Number
- Jordan Curve Theorem
- Kaplan-Yorke Conjecture
- Kepler Conjecture
- Kneser's Conjecture
- Kronecker-Weber Theorem
- Lam's Problem
- Macdonald's Constant-Term Conjecture
- Macdonald's Plane Partition Conjecture
- Magic Tour
- Middle Levels Conjecture
- Milin Conjecture
- Milnor's Conjecture
- Modularity Theorem
- Mordell Conjecture
- Moving Sofa Problem
- Netto's Conjecture
- Nirenberg's Conjecture
- Perfect Graph Theorem
- Perfect Magic Cube
- Petersson Conjecture
- Poincaré Conjecture
- Power Series
- Prime Arithmetic Progression
- Prime Magic Square
- Prime Number Theorem
- Projective Plane Crossing Number
- Quillen-Suslin Theorem
- Ramanujan's Square Equation
- Reciprocal Fibonacci Constant
- Refined Alternating Sign Matrix Conjecture
- Road Coloring Problem
- Robbins Conjecture
- Robertson Conjecture
- Rubik's Cube
- Ruth-Aaron Pair
- Schmidt's Problem
- Serre's Conjecture
- Serre's Problem
- Shafarevich Conjecture
- Sierpiński's Conjecture
- Smale's Problems
- Smith Conjecture
- Snark
- Solved Problems
- Stanley-Wilf Conjecture
- Strong Perfect Graph Theorem
- Taniyama-Shimura Conjecture
- Tau Conjecture
- Tetrahedron Line Picking
- Weisstein's Conjecture
- Yff Conjecture
- Znám's Problem