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

  • B.N. Khabibullin Bashkir State University, Bashkortostan
Keywords: subharmonic function, meromorphic function, entire function, Nevanlinna theory, $\delta$-subharmonic function, Edrei-Fuchs Lemma on small arcs


Let $E$ be a measurable subset in a segment $[0,r]$ in the positive part of the real axis in the complex plane, and $U=u-v$ be the difference of subharmonic functions $u\not\equiv -\infty$ and $v\not\equiv -\infty$ on the complex plane. An integral of the maximum on circles centered at zero of $U^+:=\sup\{0,U\} $ or $|u|$ over $E$ with a function-multiplier $g\in L^p(E) $ in the integrand is estimated, respectively, in terms of the characteristic function $T_U$ of $U$ or the maximum of $u$ on circles centered at zero, and also in terms of the linear Lebesgue measure of $E$ and the $ L^p$-norm of $g$. Our main theorem develops the proof of one of the classical theorems of Rolf Nevanlinna in the case $E=[0,R]$, given in the classical monograph by Anatoly A. Goldberg and Iossif V. Ostrovsky, 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 $U$ or $u$, provided that $U$ has an integral normalization near zero or $u(0)\geq 0$, respectively.


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How to Cite
Khabibullin B. Integrals of subharmonic functions and their differences with weight over small sets on a ray. Mat. Stud. [Internet]. 2020Dec.25 [cited 2021Dec.9];54(2):162-71. Available from: