Poincaré theorem
# Poincaré theorem

Poincaré theorem may refer to:

* Poincaré conjecture, on homeomorphisms to the sphere;
* Poincaré recurrence theorem, on sufficient conditions for recurrence to take place in dynamical systems;
* Poincaré-Bendixson theorem, on the existence of attractors for two-dimensional dynamical systems;
* Poincaré–Birkhoff–Witt theorem, concerning lie algebras and their universal envelopes;
* Poincaré lemma.
