(number theory) The mathematical theorem which states that, for given odd prime numbers p and q, the question of whether p is a square modulo q is equivalent to the question of whether q is a square modulo p.

(grammar) A pronoun referring to an antecedent in the plural, and expressing a mutual relation.

Any scientific principle that expresses various reciprocal relationships for the behaviour of a physical system.

plural of ethic of reciprocity

(mathematics) Synonym of inverse proportion

plural of reciprocity principle

plural of prime reciprocal magic square

(number theory, recreational mathematics) A magic square using the decimal digits of the reciprocal of a prime number.