Bloch's theorem

== English == === Etymology 1 === Named after the physicist Felix Bloch. ==== Proper noun ==== Bloch's theorem (physics) A theorem stating that the energy eigenstates for an electron in a crystal can be written as Bloch waves. === Etymology 2 === Named after the French mathematician André Bloch. ==== Proper noun ==== Bloch's theorem (mathematics) A theorem that gives a lower bound on the size of a disc in which an inverse to a holomorphic function exists.