Convergence of eigenvalues for a highly non-self-adjoint differential operator

In this paper we study a family of operators dependent on a small parameter $ε> 0$, which arise in a problem in fluid mechanics. We show that the spectra of these operators converge to N as $ε\to 0$, even though, for fixed $ε> 0$, the eigenvalue asymptotics are quadratic.

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