most citedFast estimation of propagation constants in crossed gratings

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math.NA2026

Boundedness of Left Half-Plane Eigenvalues for Coefficient-Coupled Sturm--Liouville Problems with Application to Fourier Modal Methods

Ehsan Faghihifar

We study a class of Sturm--Liouville problems of the form \[ -(p\,y')' + q\,y = λ\, w\, y, \] on a finite interval with complex-valued coefficients, where and are piecewise…