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thought.

Etymology

From the Ancient Greek ??uu?, (perfect passive ????uu??) something received or taken. Thus, something taken for granted in an argument.

Comparison with theorem

There is no formal distinction between a lemma and a theorem, only one of intention (see ). A result is called a lemma when it is a minor result whose purpose is to help prove a more substantial theorem, and the author does not expect it to be useful in other

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