Reciprocal trade agreement, entered into in order to reduce (or eliminate) tariffs, quotas and other trade restrictions on items traded between the signatories
Interstate reciprocity, recognition of sibling federated states' laws:
Reciprocity (international relations), principle that favours, benefits, or penalties that are granted by one state to the citizens or legal entities of another, should be returned in kind
Cubic reciprocity, theorems that state conditions under which the congruence x3 ≡ p (mod q) is solvable
Quartic reciprocity, a collection of theorems in elementary and algebraic number theory that state conditions under which the congruence x4 ≡ 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
Reciprocity (projective geometry), a collineation from a projective space onto its dual space, taking points to hyperplanes (and vice versa) and preserving incidence
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
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