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math.OA2019
Fredholm conditions for invariant operators: finite abelian groups and boundary value problems
Alexandre Baldare, Rémi Côme, Matthias Lesch +1
We answer the question of when an invariant pseudodifferential operator is Fredholm on a fixed, given isotypical component. More precisely, let be a compact group acting on a s…
math.OA2018
Sums of regular selfadjoint operators in Hilbert-C*-modules
Matthias Lesch, Bram Mesland
We introduce a notion of weak anticommutativity for a pair (S,T) of self-adjoint regular operators in a Hilbert-C*-module E. We prove that the sum of such pairs is self-adjoi…