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math-ph2020★ 28 cited
Hearing Euler characteristic of graphs
Michał Ławniczak, Pavel Kurasov, Szymon Bauch +3
The Euler characteristic and the total length are the most important topological and geometrical characteristics of a metric graph. Here, and …
math-ph2006
Finite speed of propagation and local boundary conditions for wave equations with point interactions
Pavel Kurasov, Andrea Posilicano
We show that the boundary conditions entering in the definition of the self-adjoint operator describing the Laplacian plus a finite number of point interactions are local if and on…