Abstract
In this paper we study divisorial extremal neighborhoods 
such that 0 ∈ X is a cA
n
type threefold terminal singularity, and Γ=f(E) is a smooth curve, where E is the f-exceptional divisor. We view a divisorial extremal neighborhood as a one parameter smoothing of certain surface singularities, and based on this we give a classification of such neighborhoods.
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