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Improving an inequality for sums of elements of matrix powers |
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| Institution: | Tampere University Central Hospital SF-33520 Tampere, Finland;Department of Mathematical Sciences University of Tampere P.O. Box 607 SF-33101 Tampere, Finland |
| Abstract: | The inequality 3su A3 ⩾ su A su A2, which is known to hold for any symmetric nonnegative 3 X 3 matrix A, is sharpened in three different ways. Here su denotes the sum of elements. |
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