1- A is positive definite. This means that A is symmetric and for all :3 9 {[6, 2: 7E 0 implies that m'Am > 0.
1- A is positive definite. This means that A is symmetric and for all :3 9 {[6, 2: 7E 0 implies that m'Am > 0. 2. A is symmetric and all its eigenvalues are greater than 0. This means that in the spectral decomposition, A = FAI" with I' orthogonal and A diagonal, all the diagonal elements of A are positive
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