A mathematical theorem which states that the square of the length of the hypotenuse of a right triangle is equal to the sum of the squares of those of the two other sides.
A generalization of the Pythagorean theorem for Euclidean triangles to Hilbert spaces
Origin
Named after Pythagoras (from Ancient Greek Πυθαγόρας), the Greek mathematician and philosopher who by tradition is credited with the theorem’s discovery and proof.
Modern English dictionary
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