# AGA

## Seminar

### Approximations of strongly singular couplings at quantum graph vertices

Seminar Room 1, Newton Institute

#### Abstract

Approximation of a general strongly singular coupling in the center of a star graph by means of a delta-coupling and delta-interactions will be presented. We will (i) formulate necessary conditions under which the approximation is possible; (ii) show a way how to realize such approximation; (iii) explain its character: we will demonstrate that the coupling is approximated in the norm-resolvent sense.

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