How to diagonalise a symmetric matrix by multipying transpose?
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One of the themes of Gilbert Strang's books is the ubiquity of ATA and ATCA (with C positive semidefinite) in mathematics. For example, the adjoint of the gradient operator is the negative divergence operator, and the Laplacian is the divergence of the gradient. In one book Strang states, "I have learned to look for ATCA
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