181 citations · 771 across the 48 of their papers we have counts for
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math-ph2005★ 2 cited
Existence of spectral gaps, covering manifolds and residually finite groups
Fernando Lledó, Olaf Post
In the present paper we consider Riemannian coverings with residually finite covering group and compact base space . In particular, we give two general…
math-ph2005★ 36 cited
Branched quantum wave guides with Dirichlet boundary conditions: the decoupling case
Olaf Post
We consider a family of open sets which shrinks with respect to an appropriate parameter to a graph. Under the additional assumption that the vertex neighbourhoods are sm…