Question: Give a direct proof that the finite element matrix (11.171) is positive definite, by either (a) Determining its L D LT decomposition, or (b) Finding

Give a direct proof that the finite element matrix (11.171) is positive definite, by either
(a) Determining its L D LT decomposition, or
(b) Finding its eigenvalues, using Exercise 8.2.48.

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