Ullman--Stahl--Totik regularity for conjugacy measures
Abstract
We consider probability measures whose distribution functions solve conjugate equations between two compatible systems of increasing maps on the unit interval. We give sufficient conditions for Ullman--Stahl--Totik regularity in terms of finite compositions of the source maps and a lower mass estimate which holds at Lebesgue almost every point. Our result substantially extends a regularity theorem of Mantica and Totik by allowing nonlinear target maps and replacing their assumptions on convexity, concavity, and displacement near fixed points. The proof uses the mass criterion of Stahl and Totik from logarithmic potential theory. We give further sufficient conditions involving uniform mesh bounds, sets where derivatives equal one, and endpoint drift. Examples distinguish these conditions and show that the uniform version of the lower mass estimate can fail for regular conjugacy measures.
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BibTeX
@misc{okamura2026ullmanstahltotik,
title = {{Ullman--Stahl--Totik regularity for conjugacy measures}},
author = {Kazuki Okamura},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41422},
eprint = {2610.41422},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41422},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Ullman--Stahl--Totik regularity for conjugacy measures
AU - Kazuki Okamura
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41422
UR - https://arxiv.org/abs/2610.41422
AB - We consider probability measures whose distribution functions solve conjugate equations between two compatible systems of increasing maps on the unit interval. We give sufficient conditions for Ullman--Stahl--Totik regularity in terms of finite compositions of the source maps and a lower mass estimate which holds at Lebesgue almost every point. Our result substantially extends a regularity theorem of Mantica and Totik by allowing nonlinear target maps and replacing their assumptions on convexity, concavity, and displacement near fixed points. The proof uses the mass criterion of Stahl and Totik from logarithmic potential theory. We give further sufficient conditions involving uniform mesh bounds, sets where derivatives equal one, and endpoint drift. Examples distinguish these conditions and show that the uniform version of the lower mass estimate can fail for regular conjugacy measures.
ER -