42 citations · 64 across the 14 of their papers we have counts for
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math.FA2018★ 4 cited
On sampling and interpolation by model sets
Christoph Richard, Christoph Schumacher
We refine a result of Matei and Meyer on stable sampling and stable interpolation for simple model sets. Our setting is model sets in locally compact abelian groups and Fourier ana…
math.FA2015
Graph Laplacians do not generate strongly continuous semigroups
Thomas Kalmes, Christoph Schumacher
We show that for graph Laplacians on a connected locally finite simplicial undirected graph with countable infinite vertex set none of the operators $α\,\mathrm{Id}+β…
math.FA2010★ 42 cited
The problem of deficiency indices for discrete Schrödinger operators on locally finite graphs
Sylvain Golénia, Christoph Schumacher
The number of self-adjoint extensions of a symmetric operator acting on a complex Hilbert space is characterized by its deficiency indices. Given a locally finite unoriented simple…