3 papers
math.SP2024
Abstract Left-Definite Theory: A Model Operator Approach, Examples, Fractional Sobolev Spaces, and Interpolation Theory
Christoph Fischbacher, Fritz Gesztesy, Paul Hagelstein +1
We use a model operator approach and the spectral theorem for self-adjoint operators in a Hilbert space to derive the basic results of abstract left-definite theory in a straightfo…
math.AP2021
Sharp Weak Type Estimates for a Family of Zygmund Bases
Paul Hagelstein, Alex Stokolos
Let be a collection of rectangular parallelepipeds in whose sides are parallel to the coordinate axes and such that consists of parallele…
math.OC2015
On the stability of cycles by delayed feedback control
D. Dmitrishin, P. Hagelstein, A. Khamitova +1
We present a delayed feedback control (DFC) mechanism for stabilizing cycles of one dimensional discrete time systems. In particular, we consider a delayed feedback control for sta…