Tychonoff's theorem (disambiguation)
Tikhonov's theorem or Tychonoff's theorem may refer to any of several mathematical theorems named after the Russian mathematician Andrey Tikhonov:
- Tychonoff's theorem, the product of any collection of compact topological spaces is compact
- Tikhonov's fixed point theorem, concerning fixed points of continuous mappings on compact subsets of certain topological vector spaces
- Tikhonov's theorem (dynamical systems), concerning limiting behaviour of solutions of systems of differential equations applicable to (among other things) chemistry