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SOLVED: How to prove this problem? (4,5)Theorem 4: Each of the following tests is a necessary and sufficient condition for a real symmetric matrix A to be positive semidefinite (non-negative definite):1) xtAx > 0, V x2) All the eigenvalues of A satisfy Xi > 0.3) All the principal submatrices have nonnegative determinants.4) No pivots are negative.5) There is a matrix R, possibly with dependent columns, such that A = RtR.(Proof) Exercise
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