What’s the difference between theorem, lemma and corollary?

Can anybody explain me what is the basic difference between theorem, lemma and corollary?

We have been using it for a long time but I never paid any attention. I am just curious to know.

Answer

Lemma is generally used to describe a “helper” fact that is used in the proof of a more significant result.

Significant results are frequently called theorems.

Short, easy results of theorems are called corollaries.

But the words aren’t exactly that set in stone.

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Source : Link , Question Author : monalisa , Answer Author : Community

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