EntityQ472883· pop 28· linked from 91 articlesquadratic reciprocitySign in to savetheoremConnectionsalgebraic number fieldEntitySpringer Science+Business MediaEntityCarl Friedrich GaussEntityLeonhard EulerEntityInternational Standard Book NumberEntityDavid HilbertEntityprime numberEntitynumber theoryEntityWayback MachineEntitymathematical proofEntitydigital object identifierEntityquadratic equationEntityabstract algebraEntityRichard DedekindEntitymathematical inductionEntityarithmetic progressionEntityringEntityJohann Peter Gustav Lejeune DirichletEntityCarl Gustav Jacob JacobiEntityfieldEntityCategoriesAlgebraic number theoryModular arithmeticQuadratic residueTheorems in number theory