from The Century Dictionary and Cyclopedia
- Pertaining to or invented by the eminent French mathematician Adrien Marie Legendre (1752–1833).
- a symbol, looking like a fraction in parenthesis, used in the theory of numbers. It is equal to plus or minus unity, according as the numerator is or is not a quadratic residue of the denominator. It vanishes if the numerator is divisible by the denominator.
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