A **definite quadratic form** refers to a specific type of quadratic expression in multiple variables that has particular properties regarding the sign of its output. In mathematical terms, a quadratic form can generally be represented as: \[ Q(\mathbf{x}) = \mathbf{x}^T A \mathbf{x} \] where: - \(\mathbf{x}\) is a vector of variables (e.g., \((x_1, x_2, ...
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