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Far East Journal of Mathematical Sciences (FJMS)
Abstract: Let A be a
block operator matrix on a Hilbert
space
Then
the set, shell of quadratic numerical range of A is
defined and in the case
we compute the shell of quadratic
numerical range of A .
Keywords and phrases: numerical range, shell, quadratic numerical range.
Number of Downloads: 3 | Number of Views: 1228
P-ISSN: 0972-0871
E-ISSN: 2584-1246
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