Common
Lemma (mathematics)
Theorem for proving more complex theorems
Lemma (mathematics)
In mathematics and other fields, a lemma (pl.: lemmas or lemmata) is a generally minor proven proposition used to prove a larger statement. For that reason, it is also known as a "helping theorem" or an "auxiliary theorem". 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.
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