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A note on star partial order preservers on the set of all variance-covariance matrices
Dolinar, Gregor, 11.08.1971- ...
Let ▫$H_n^+(\mathbb{R})$▫ be the cone of all positive semidefinite ▫$n \times n$▫ real matrices. We describe the form of all surjective maps on ▫$H_n^+(\mathbb{R})$▫, ▫$n=3$▫, that preserve the star ...partial order in both directions.
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