KnowraLagrange's four-square theoremLinked fromLinked fromThe 10 pages that link to Lagrange's four-square theorem, each with the reason it gives.All 10Broader topic 3Related 2Compared with 5Joseph-Louis LagrangeBroader topic: It exemplifies his contributions to number theory beyond mechanics.Quadratic formBroader topic: It is a central example of a representation problem for a quadratic form.Additive number theoryBroader topic: This solved a landmark representation problem for sums of squares.