Theorem
/θˈɪrəm/
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Definition
(noun) A mathematical statement of some importance that has been proven to be true. Minor theorems are often called propositions. Theorems which are not very interesting in themselves but are an essential part of a bigger theorem's proof are called lemmas.
Sentence Examples
That method's OK but if you use the factor theorem here ...
Obviously, the theorem is true for finite sets.
CEFR Practice Quiz
Pythagoras is famous for his mathematical ____ which describes the relationship between the sides of a triangle today.