2 citations · 3 across the 4 of their papers we have counts for
4 papers
Isospectrality for graph Laplacians under the change of coupling at graph vertices: necessary and sufficient conditions
Yulia Ershova, Irina I. Karpenko, Alexander V. Kiselev
Laplace operators on finite compact metric graphs are considered under the assumption that matching conditions at graph vertices are of and types. Assuming rational indepe…
Isospectrality for graph Laplacians under the change of coupling at graph vertices
Yulia Ershova, Irina I. Karpenko, Alexander V. Kiselev
Laplacian operators on finite compact metric graphs are considered under the assumption that matching conditions at graph vertices are of and types. An infinite series of…
On Self-Adjointness Of 1-D Schrödinger Operators With -Interactions
I. I. Karpenko, D. L. Tyshkevich
In the present work we consider in the Schrödinger operator . We investigate and com…
On the model of a skew--selfadjoint operator with a simple spectrum on a Hilbert quaternion module
Dmitry Tyshkevich, Irina Karpenko
In this work we construct the model of a skew--selfadjoint operator with a simple spectrum acting on a Hilbert quaternion bimodule. This result is based on the Spectral Theorem for…