Joint spectrum of commuting normal operators and its position. Estimates for roots of second order polynomials. Definition of well-posedness of boundary-value problems
Part of the Operator Theory Advances and Applications book series (OT, volume 92)
For the sake of simplicity, we begin with an important particular case where A and B are arbitrary commuting self-adjoint operators (c.s.o.) in a separable Hilbert space H.
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© Birkhäuser Verlag 1997