Question: factorization (11) of a circulant matrix (9) with the n-vector a as its first column. In (11), W is the n n discrete Fourier transform

factorization (11) of a circulant matrix (9) with the n-vector a as its first column. In (11), W is the n n discrete Fourier transform matrix and diag(W a) is the diagonal matrix with the vector W a (the discrete Fourier transform of a) on its diagonal. (a) Suppose T (a) is nonsingular. Show that its inverse T (a)1 is a circulant matrix. Give a fast method for computing the vector b that satisfies T (b) = T (a)1. (b) Let a and b be two n-vectors. Show that the product T (a)T (b) is a circulant matrix. Give a fast method for computing the vector c that satisfies T (c) = T (a)T (b)

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