Classes of Quasi-nearly Subharmonic Functions |
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Authors: | Miroslav Pavlovi? Juhani Riihentaus |
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Institution: | (1) Matematic̆ki Fakultet, Studentski Trg 16, Belgrade, P.P. 550, Serbia;(2) Department of Mathematics, University of Joensuu, P.O. Box 111, 80101 Joensuu, Finland |
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Abstract: | It is well known and important that if u ≥ 0 is subharmonic on a domain Ω in ℝ
n
and p > 0, then there is a constant C(n,p) ≥ 1 such that for each open ball B(x,r) ⊂ Ω. The definition of a relatively new function class, quasi-nearly subharmonic functions, is based on such a generalized
mean value inequality. It is pointed out that the obtained function class is natural. It has important and interesting properties
and, at the same time, it is large: In addition to nonnegative subharmonic functions, it includes, among others, Hervé’s nearly
subharmonic functions, functions satisfying certain natural growth conditions, especially certain eigenfunctions, polyharmonic
functions and generalizations of convex functions. Further, some of the basic properties of quasi-nearly subharmonic functions
are stated in a unified form. Moreover, a characterization of quasi-nearly subharmonic functions with the aid of the quasihyperbolic
metric and two weighted boundary limit results are given.
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Keywords: | Subharmonic Quasi-nearly subharmonic Bochner-Martinelli formula Approach region Boundary limit |
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