The spectra of certain elliptic operators in 𝑅^{𝑁}

Brenner, Terence

doi:10.1090/S0002-9939-1988-0943060-6

The spectra of certain elliptic operators in $\textbf {R}^ N$
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Proc. Amer. Math. Soc. 103 (1988), 424-428 Request permission

Abstract:

We give sufficient conditions for the spectra and essential spectra of certain classes of operators in ${R^N}$ to be contained in an interval of the form $[d,\infty )$.

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On the spectrum of the perturbed polyharmonic operator