1208.4686 (Dmitry K. Gridnev)

Essential spectrum of a limit of self--adjoint operators    [PDF]

Dmitry K. Gridnev

For a sequence of self--adjoint operators, which converges in the norm resolvent sense, the formula is derived, which expresses the essential spectrum of the limit through the essential spectrum of the elements of the sequence.

View original: http://arxiv.org/abs/1208.4686