A theorem is a statement, usually in mathematics, that has been proven to be true using logical steps and previously known facts. It starts as an idea and becomes a theorem only after a correct proof is found.
From Latin *theorema*, from Greek *theorema* 'spectacle, that which is looked at', from *theorein* 'to look at, to consider'. The meaning shifted from 'something to be looked at' to 'a proposition to be examined and proved'.
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