Blar i Brage NMBU på forfatter "Gergelits, Tomas"
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Generalized spectrum of second order differential operators
Gergelits, Tomas; Nielsen, Bjørn Fredrik; Strakos, Zdenek (Peer reviewed; Journal article, 2020)We analyze the spectrum of the operator $\Delta^{-1} [\nabla \cdot (K\nabla u)]$, where $\Delta$ denotes the Laplacian and $K=K(x,y)$ is a symmetric tensor. Our main result shows that this spectrum can be derived from the ...