Lemma (mathematics)

Theorem for proving more complex theorems / From Wikipedia, the free encyclopedia

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In mathematics, informal logic and argument mapping, a lemma (PL: lemmas or lemmata) is a generally minor, proven proposition which is used as a stepping stone to a larger result. For that reason, it is also known as a "helping theorem" or an "auxiliary theorem".[1][2] In many cases, a lemma derives its importance from the theorem it aims to prove; however, a lemma can also turn out to be more important than originally thought.[3]