Linear-equation systems have variable-coefficient matrices {quadratic form} and solution matrices. Solution matrix X transpose times variable-coefficient matrix A times solution matrix X equals bivariate sum with three coefficients: (transpose of X) * A * X = a*x*x + b*x*y + c*y*y.
Mathematical Sciences>Algebra>Equation>System>Matrix>Kinds
3-Algebra-Equation-System-Matrix-Kinds
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Date Modified: 2022.0224