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- W4205175205 abstract "Let bdM be Hn or Cn×n, the real linear space of all n × n hermitian matrices and the complex linear space of all n × n complex matrices, respectively. For 1 ⩽ p ⩽ q ⩽ n, the (p, q) numerical radius of A ∈ M is defined and denoted by rp, q (A) = {|Ep (X∗AX)|: X∈ Dn×q, X∗X = Iq}, where Ep(Y) denotes the pth elementary symmetric function on the eigenvalues of Y. We characterize the linear operators φ on M that satisfy rp, q(φ(A)) = rp, q(A) for all A∈ M." @default.
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- W4205175205 date "1994-04-01" @default.
- W4205175205 modified "2023-09-28" @default.
- W4205175205 title "Linear operators preserving the (p,q) numerical radius" @default.
- W4205175205 doi "https://doi.org/10.1016/0024-3795(94)90101-5" @default.
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