Euler-s-criterion meaning

(number theory) A theorem which states that, given a positive integer a which is coprime to an odd prime number p, a is a quadratic residue of p if and only if is congruent to 1 modulo p.
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Origin of euler-s-criterion

  • Named after Leonhard Euler (1707–1783), Swiss mathematician and physicist, who devised the criterion in 1748.

    From Wiktionary