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Definition of Pythagorean theorem
1. Proper noun. (geometry) 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. ¹
2. Proper noun. (functional analysis) A generalization of the Pythagorean theorem for Euclidean triangles to Hilbert spaces ¹
¹ Source: wiktionary.com