Designs
- 15 Schoolgirl Problem
- 36 Officer Problem
- Affine Plane
- All-Ones Problem
- Alon-Tarsi Conjecture
- Anallagmatic Pavement
- Antimagic Square
- Block Design
- Bruck-Ryser-Chowla Theorem
- C-Matrix
- Costas Array
- Design
- Design Theory
- Dinitz Problem
- Doubly Truncated Witt Graph
- Euler's Graeco-Roman Squares Conjecture
- Euler Square
- Fisher's Block Design Inequality
- Golomb Ruler
- Hadamard Design
- Hadamard Matrix
- Heterosquare
- Howell Design
- Katona's Problem
- Kirkman's Schoolgirl Problem
- Kirkman Triple System
- Knights Problem
- Lam's Problem
- Large Witt Graph
- Latin Rectangle
- Latin Square
- Leonard Graph
- Lights Out Puzzle
- Magic Hexagon
- Magma
- Moufang Plane
- Orthogonal Array
- Parallel Class
- Partial Latin Square
- Prime Array
- Rational Distances
- Resolvable
- Room Square
- Separating Family
- Skolem Sequence
- Social Golfer Problem
- SOMA
- Spherical Design
- Steiner Quadruple System
- Steiner System
- Steiner Triple System
- Symmetric Block Design
- t-Design
- Talisman Hexagon
- Talisman Square
- Transversal Array
- Transversal Design
- Unital
- Witt Design