# Legendre symbol

## English

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### Etymology

Named after French mathematician Adrien-Marie Legendre (1752–1833), who introduced the symbol in 1798 in his work Essai sur la Théorie des Nombres ("Essay over the Theory of Numbers").

### Noun

Legendre symbol (plural Legendre symbols)

1. (number theory) Mathematical function of an integer and a prime, written ${\displaystyle \left({a \over p}\right)}$, indicating whether a is a square modulo p.