Classifies negativity-preserving transforms on single and multi-variable tuples of symmetric matrices, showing absolute monotonicity in one variable and homotheties in the other, plus the complex case.
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Negativity-preserving transforms of tuples of symmetric matrices
Classifies negativity-preserving transforms on single and multi-variable tuples of symmetric matrices, showing absolute monotonicity in one variable and homotheties in the other, plus the complex case.