Roger Nichols

activity

20102023

most citedInverse Spectral Theory for Sturm-Liouville Operators with Distributional Potentials

30 citations · 91 across the 25 of their papers we have counts for

collaborators

Showing 2014 · math.FAShow all

2 papers · 2 filters

math.FA2014

On a problem in eigenvalue perturbation theory

Fritz Gesztesy, Sergey N. Naboko, Roger Nichols

We consider additive perturbations of the type $K_{t} = K_{0} + t W$ , $t \in [0, 1]$ , where $K_{0}$ and $W$ are self-adjoint operators in a separable Hilbert space $H$ and $W$ is boun…

math.FA2014

A Jost-Pais-type reduction of (modified) Fredholm determinants for semi-separable operators in infinite dimensions

Fritz Gesztesy, Roger Nichols

We study the analog of semi-separable integral kernels in $H$ of the type $$ K(x,x')=\begin{cases} F_1(x)G_1(x'), & a<x'< x< b, \\ F_2(x)G_2(x'), & a<x<x'<b, \end{cases}…