Abstract
We obtain a representation formula for the derivative of the spectral shift function ξ(λ; B, ∊) related to the operators [Formula: see text] and H(B, ∊) = H0(B, ∊) + V(x, y), B > 0, ∊ > 0. We establish a limiting absorption principle for H(B, ∊) and an estimate [Formula: see text] for ξ′(λ; B, ∊), provided λ ∉ σ(Q), where [Formula: see text].
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