Browsing Pure Mathematics by Subject "linear preserver"
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Linear preservers of polynomial numerical hulls of matrices
(Elsevier, 2019-08-15)Let Mn be the algebra of all n × n complex matrices, 1 ≤ k ≤ n − 1 be an integer, and φ : Mn −→ Mn be a linear operator. In this paper, it is shown that φ preserves the polynomial numerical hull of order k if and only if ...