Let S be a subspace of an inner product space V. Let {x1, ... , xn} be an orthogonal
Chapter 5, Problem 35(choose chapter or problem)
Let S be a subspace of an inner product space V. Let {x1, ... , xn} be an orthogonal basis for S and let x V. Show that the best least squares approximation to x by elements of S is given by p = n i=1 x, xi xi, xi xi
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