# Birkhoff's theorem

**Birkhoff's theorem** may refer to several theorems named for the American mathematician George David Birkhoff:

- Birkhoff's theorem (relativity)
- Birkhoff's theorem (electromagnetism)
- Birkhoff's ergodic theorem
- Birkhoffâ€“von Neumann theorem on Birkhoff polytope

It may also refer to theorems named for his son, Garrett Birkhoff:

- Birkhoff's HSP theorem, concerning the closure operations of homomorphism, subalgebra and product
- Birkhoff's representation theorem for distributive lattices
- Birkhoff's theorem (equational logic), stating that syntactic and semantic consequence coincide

This article is issued from Wikipedia - version of the 2/29/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.