Total positivity of sums, Hadamard products and Hadamard powers: Results and counterexamples
Total positivity of sums, Hadamard products and Hadamard powers: Results and counterexamples
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总和、Hadamard 产品和 Hadamard 幂的总正性:结果和反例
DOI:
10.1016/j.laa.2017.01.013
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发表时间:
2017
影响因子:
1.1
通讯作者:
Fallat S
中科院分区:
文献类型:
--
作者:
Fallat S
We show that, for Hankel matrices, total nonnegativity (resp. total positivity) of order r is preserved by sum, Hadamard product, and Hadamard power with real exponent t≥ r− 2. We give examples to show that our results are sharp relative to matrix size and structure (general, symmetric or Hankel). Some of these examples also resolve the Hadamard critical-exponent problem for totally positive and totally nonnegative matrices.
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