The algebra of hyperboloids of revolution |
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Authors: | Javier F Cabrera Geoffrey S Watson |
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Institution: | Rutgers University New Brunswick, New Jersey 08903 USA;Department of Statistics Princeton University Princeton, New Jersey 08544 USA |
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Abstract: | If we change the sign of p ? m columns (or rows) of an m × m positive definite symmetric matrix A, the resultant matrix B has p negative eigenvalues. We give systems of inequalities for the eigenvalues of B and of the matrix obtained from B by deleting one row and column. To obtain these, we first develop characterizations of the eigenvalues of B which are analogous to the minimum-maximum properties of the eigenvalues of a symmetric A, i.e. the Courant-Fischer theorem. These results arose from studying probability distributions on the hyperboloid of revolution . By contrast, the familiar results are associated with the sphere x21 + ? + x2m = 1. |
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