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- W157673242 abstract "The resolvent R H(Z), Im z ≠0, of a Schrodinger operator H = -△ + V on L 2(ℝn) is typically not compact (however, it usually is on L 2(X), when X is compact). If R H(Z) is compact, then σ(R H(Z)) is discrete with zero the only possible point in the essential spectrum. Hence, one would expect that H has discrete spectrum with the only possible accumulation point at infinity (i.e., σess(H)) = 0). In this way, the σ(H) reflects the compactness of R H(Z)- It turns out that these properties are basically preserved if, instead of R H(Z) being compact, it is compact only when restricted to any compact subset of ℝn. This is the notion of local compactness. From an analysis of this notion we will see that the discrete spectrum of H is determined by the behavior of H on bounded subsets of ℝn and the essential spectrum of H is determined by the behavior of H (in particular, V) in a neighborhood of infinity." @default.
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- W157673242 date "1996-01-01" @default.
- W157673242 modified "2023-09-23" @default.
- W157673242 title "Locally Compact Operators and Their Application to Schrödinger Operators" @default.
- W157673242 doi "https://doi.org/10.1007/978-1-4612-0741-2_10" @default.
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