Editing Reciprocity (section)

==Mathematics==
* [[Reciprocity law]] (law of reciprocity) in mathematics, including
** [[Quadratic reciprocity]], a fundamental result in number theory
** [[Cubic reciprocity]], theorems that state conditions under which the congruence {{nowrap|''x''<sup>3</sup> ≡ ''p'' (mod ''q'')}} is solvable
** [[Quartic reciprocity]], a collection of theorems in elementary and algebraic number theory that state conditions under which the congruence {{nowrap|''x''<sup>4</sup> ≡ ''p'' (mod ''q'')}} is solvable
** [[Artin reciprocity law]], a general theorem in number theory that provided a partial solution to Hilbert's ninth problem
** [[Reciprocity relation]] or ''exact differential'', a mathematical differential of the form ''dQ'', for some differentiable function ''Q''
* [[Weil reciprocity law]]
* [[Mathematics of CRC#Reciprocal polynomials|Reciprocal polynomials]], the coefficients of the remainder polynomial are the bits of the CRC
* [[Reciprocal square root#Iterative methods for reciprocal square roots|Reciprocal square root]]
* [[Reciprocity (projective geometry)]], a collineation from a projective space onto its dual space, taking points to hyperplanes (and vice versa) and preserving incidence
* [[Frobenius reciprocity]], from group representation theory
* Reciprocity law for [[Dedekind sums]]
* [[Stanley's reciprocity theorem]], states that a certain functional equation is satisfied by the generating function of any rational cone and the generating function of the cone's interior
* [[Hermite reciprocity]] for invariants of binary forms.