English

The Howland-Kato Commutator Problem II

Spectral Theory 2023-05-29 v1

Abstract

We continue the search, begun by Kato, for all pairs of real, bounded, measurable functions {f,g}\{f,g\} that result in a positive commutator [if(P),g(Q)][if(P),g(Q)]. We prove a number of partial results including a connection with Loewner's celebrated theorem on matrix monotone functions.

Keywords

Cite

@article{arxiv.2305.16745,
  title  = {The Howland-Kato Commutator Problem II},
  author = {Richard Froese and Ira Herbst},
  journal= {arXiv preprint arXiv:2305.16745},
  year   = {2023}
}
R2 v1 2026-06-28T10:47:17.880Z