Does any body know why the inverse of a circulant matrix is circulant? is there any reference or easy proof for that?
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Do you know something about the eigenvectors of a circulant matrix? – Ted Shifrin Nov 14 '19 at 22:48
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yes I know the inverse is $YEY^{*}$ but how to proof its circulant? – user9272398 Nov 14 '19 at 23:01