ALMOST DIAGONAL MATRICES WITH MULTIPLE OR CLOSE EIGENVALUES.
STANFORD UNIV CALIF DEPT OF COMPUTER SCIENCE
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If A D E where D is the matrix of diagonal elements of A, then when A has some multiple or very close eigenvalues E has certain characteristic properties. These properties are considered both for hermitian and non-hermitian A. The properties are important in connection with several algorithms for diagonalizing matrices by similarity transformations.
- Theoretical Mathematics