| Definitions | | quadratic reciprocity |
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noun
- (numbertheory) Mathematical theorem relating the Jacobi symbol <math>\left({a \over b}\right)</math> to the inverted <math>\left({b \over a}\right)</math>, essentially relating the question of whether a is a square modulo b to the opposite question of whether b is a square modulo a (or modulo the prime factors).
Etymology: quadratic, Quadratic refers to the square, squaring in the question addressed.
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