Another theorem that has been proved in many different ways is the theorem of quadratic reciprocity—Carl Friedrich Gauss alone published eight different proofs of this theorem.
Kita teorema, įrodyta daugeliu būdų, yra kvadratinis apgręžiamumas (angl. quadratic reciprocity) – vien Karlas Friedrichas Gaussas yra pateikęs aštuonis skirtingus šios teoremos įrodymus.