(a) For which numbers b (allowing both positive and negative numbers) is the matrix positive definite? (b)...
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positive definite?
(b) Find the factorization A = LDLT when b is in the range for positive definiteness.
(c) Find the minimum value (depending on b it might be finite or it might be - ) of the function p(x.y) = x2 + 2bxy + 4y2 - 2y.
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