Harvard AM205 video 1.7 - Underdetermined least squares

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Harvard Applied Math 205 is a graduate-level course on scientific computing and numerical methods. This video considers underdetermined linear systems that have more parameters than constraints. The video demonstrates how the previous linear least squares framework can be generalized to handle problems of this type.

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this series is incredibly well made. Thanks for putting it on YouTube!

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Why is it that S^TS is positive definite then A^TA + S^TS is invertible ?

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