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Rules for positive definite matrix. What are they? My text book explains them in a very...

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Advance Math

Rules for positive definite matrix.

What are they? My text book explains them in a very confusingway.

Also:

\"A matrix A is said to be positive definite if it is symmetricand if and only if each of its leading principal sub matrices has apositive determinate\"

How do I get the leading principal sub matrices?

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