Formulas
- Kronecker's lemma
- Kronecker's theorem
- Kronheimer–Mrowka basic class
- Krull–Schmidt theorem
- Kruskal's tree theorem
- Krylov–Bogolyubov theorem
- Stratifold
- Kummer's function
- Kummer sum
- Kummer–Vandiver conjecture
- Leray spectral sequence
- Strength of a graph
- Symbolic method
- Uniformly Cauchy sequence
- Riccati equation