27 citations · 113 across the 31 of their papers we have counts for
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math.FA2013★ 1 cited
Boundary systems and (skew-)self-adjoint operators on infinite metric graphs
Carsten Schubert, Christian Seifert, Jürgen Voigt +1
We generalize the notion of Lagrangian subspaces to self-orthogonal subspaces with respect to a (skew-)symmetric form, thus characterizing (skew-)self-adjoint and unitary operators…
math.FA2013
On the perturbation of positive semigroups
Christian Seifert, Daniel Wingert
We prove a perturbation result for positive semigroups, thereby extending a heat kernel estimate by Barlow, Grigor'yan and Kumagai for Dirichlet forms (\cite{bgk2009}) to positive…