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We study the relation between the generalized eigenspace and the asymptotic expansion of the resolvent around the 
threshold $0$ for the one-dimensional discrete Schr\"odinger operator on $\mathbb Z$. We decompose the generalized 
eigenspace into the subspaces corresponding to the eigenstates and the resonance states only by their asymptotics at infinity,
and classify the coefficient operators of the singlar part of resolvent expansion completely in terms of these eigenspaces.
Here the generalized eigenspace we consider is largest possible. For an explicit computation of the resolvent expansion 
we apply the expansion scheme of Jensen-Nenciu (2001). 
This talk is based on the recent joint work with Arne Jensen (Aalborg University).

Seminar on Analysis at University of Tsukuba