Let be a symmetric 2 Ã 2 matrix. Prove that A is positive definite if and only
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be a symmetric 2 Ã 2 matrix. Prove that A is positive definite if and only if a > 0 and det A > 0.
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-- (a-2)~ ax + 2bxy + dy = x + -y a'
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We need to show that det A 0 and a 0 0 Note det A ad b 2 0 ...View the full answer
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