 04127 Taksu Cheon and Pavel Exner
 An approximation to delta' couplings on graphs
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Apr 23, 04

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Abstract. We discuss a general parametrization for
vertices of quantum graphs and show, in particular, how the
delta'_s and delta' coupling at an n edge vertex can be
approximated by means of n+1 couplings of the delta type
provided the latter are properly scaled.
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