** Noether inequality

** Zorn's lemma: Every non-empty partially ordered set in which every chain ( i. e. totally ordered subset ) has an upper bound contains at least one maximal element.

** Tukey's lemma: Every non-empty collection of finite character has a maximal element with respect to inclusion.

** word, lexeme, lemma, lexicon, vocabulary, terminology

** Schwarz – Ahlfors – Pick theorem, an extension of the Schwarz lemma for hyperbolic manifolds

** Sperner's lemma

** Schwarz lemma

** Burnside's lemma, a theorem of group theory

** The Lovász local lemma ( proved in 1975, by László Lovász & P. Erdős )

** Algorithmic Lovász local lemma ( proved in 2009, by Robin Moser and Gábor Tardos )

** Krasner's lemma, in number theory

** Hensel's lemma and Henselian rings, named after Kurt

* Noether normalization lemma, result of commutative algebra