KnowraJacobi's four-square theoremLinked fromLinked fromThe 3 pages that link to Jacobi's four-square theorem, each with the reason it gives.All 3Broader topic 1Related 2Carl Gustav Jacob JacobiBroader topic: This theorem is among Jacobi’s best-known contributions to number theory.Jacobi triple productRelated: Theta-function powers and their product expansions provide a route to the representation formula.Legendre's three-square theoremRelated: It extends the representation-counting perspective from existence to the number of four-square representations.