By S. Charmonman
Communications of the ACM,
Vol. 10 No. 12, Pages 800-801
It has been known that the eigenvalues of a certain 2n × 2n matrix can be obtained by use of two smaller matrices of order n which can be easily constructed. An algorithm is given to obtain the eigenvectors of the 2n × 2n matrix by use of the eigenvectors of the smaller matrices.
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