activity
19992003
most citedAn Interaction of An Oscillator with An One-Dimensional Scalar Field. Simple Exactly Solvable Models based on Finite Rank Perturbations Methods. I: D'Alembert-Kirchhoff-like formulae

1 citations · 3 across the 5 of their papers we have counts for

collaborators
Showing math.FAShow all

1 paper · 1 filter

math.FA1999

A Reducing of the Invariant Semidefinite Subspace Problem for Krein Noncontraction to such a Problem for Krein Isometry

Sergej A. Choroszavin

Definition. Let J be a period-2 unitary operator (some people say J is reflection operator or reflection symmetry) and U be a linear operator. If U^*JU = J (resp. U^*JU >= J) then…