A '''theorem''' is a statement that can be proven via logic which generally stems from a collection of [[postulate]]s or [[axiom]]s.<ref>''The American College Dictionary''. Random House. New York, 1956.</ref> They have been in use since Euclidean geometry as the basis of geometrical facts.<ref>"Geometry". ''The New Encyclopedia Britannica''. 15th ed.</ref>
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A '''theorem''' is a statement that can be proved by deductive reasoning.
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Some famous theorems include:<ref>''Beauty, Rigor, Surprise''</ref>