What’s a Lemma?
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Typically a non- trivial result with a routine proof. Lemmas and propositions are used as a build up to prove a theorem (usually)
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Squeeze theorem in analysis is known as

theorem in Russia. https://ru.m.wikipedia.org/wiki/%D0%A2%D0%B5%D0%BE%D1%80%D0%B5%D0%BC%D0%B0_%D0%BE_%D0%B4%D0%B2%D1%83%D1%85_%D0%BC%D0%B8%D0%BB%D0%B8%D1%86%D0%B8%D0%BE%D0%BD%D0%B5%D1%80%D0%B0%D1%85#/languages … -
In Italy too.
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remainder theorem in number theory https://en.wikipedia.org/wiki/Chinese_remainder_theorem …Thanks. Twitter will use this to make your timeline better. UndoUndo
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In physics too: Schrodinger's
Schrodinger's
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That’s a good one Sheldon
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It's
's lemma tho. - 5 more replies
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trap proof of the Pythagorean Theorem by Euclid.Thanks. Twitter will use this to make your timeline better. UndoUndo
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theorem in measure theory
theorem in analysis
theorem in geometry
lemma in group theory
lemma in graph theory
lemma in group theory

principle in analysis