English

Integrals of subharmonic functions and their differences with weight over small sets on a ray

Complex Variables 2021-01-05 v2

Abstract

Let EE be a measurable subset in a segment [0,r][0,r] in the positive part of the real axis in the complex plane, and U=uvU=u-v be the difference of subharmonic functions u≢u\not\equiv -\infty and v≢v\not\equiv-\infty on the complex plane. An integral of the maximum on circles centered at zero of U+:=sup{0,U}U^+:=\sup\{0,U\} or u|u| over EE with a function-multiplier gLp(E)g\in L^p(E) in the integrand is estimated, respectively, in terms of the characteristic function TUT_U of UU or the maximum of uu on circles centered at zero, and also in terms of the linear Lebesgue measure of EE and the Lp L^p-norm of gg. Our main theorem develops the proof of one of the classical theorems of Rolf Nevanlinna in the case E=[0,R]E=[0,R], given in the classical monograph by Anatolii A. Gol'dberg and Iosif V. Ostrovskii, and also generalizes analogs of the Edrei-Fuchs Lemma on small arcs for small intervals from the works of A.F. Grishin, M.L. Sodin, T.I. Malyutina. Our estimates are uniform in the sense that the constants in these estimates do not depend on UU or uu, provided that UU has an integral normalization near zero or u(0)0u(0)\geq 0, respectively.

Keywords

Cite

@article{arxiv.2009.07066,
  title  = {Integrals of subharmonic functions and their differences with weight over small sets on a ray},
  author = {Bulat N. Khabibullin},
  journal= {arXiv preprint arXiv:2009.07066},
  year   = {2021}
}

Comments

10 pages

R2 v1 2026-06-23T18:33:24.374Z