What is a lemma?

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A lemma is a theorem connected by a short proof to an existing theorem

A lemma is a statement that must be proven and is used to prove other statements

A lemma is a rigorous mathematical argument which unequivocally demonstrates the truth of a given proposition

A lemma is a sentence which is either always true or always false

answer is B.

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Detailed Solution

Given to define a lemma.
In mathematics, a lemma is a statement that must be proven and is used to prove other statements.
In other words, a theorem is a desired result, a corollary is a result that follows from a theorem, and a lemma is a result that is used to prove a theorem.
Thus, a lemma is a statement that must be proven and is used to prove other statements.
Hence the correct option is 2.

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