KnowraSum of squaresLinked fromLinked fromThe 6 pages that link to Sum of squares, each with the reason it gives.All 6Broader topic 1Related 3Narrower topic 2Analysis of varianceBroader topic: ANOVA decomposes sums of squares among modeled effects and unexplained variation.Euler's four-square identityNarrower topic: The identity is a multiplication rule for a particular four-term sum-of-squares expression.Legendre's three-square theoremNarrower topic: The theorem is a precise existence criterion for one particular number of integer squares.Sophie Germain's identityRelated: The quartic becomes factorable after it is rewritten as a difference of squares.Bruck–Ryser–Chowla theoremRelated: For certain orders, existence requires an integer to be expressible as a sum of two squares.Degen's eight-square identityRelated: Each side of Degen's identity is organized as a sum of eight such terms.