Results on meromorphic φ -normal functions

Rauno Aulaskari*, Shamil Makhmutov, Jouni Rättyä

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Let φ: [0, 1) → (0, ∞) be an increasing function. A meromorphic function f in the unit disc is said to be φ -normal if its spherical derivative f#(z):=|f′(z)|/(1 +|f(z)|2) satisfies f#(z) = O{script} (φ(|z|)) as |z| → 1-. This article is devoted to the study of meromorphic φ-normal functions. In particular, an analogue of the Lohwater-Pommerenke theorem and several equivalent characterizations for φ-normal functions are established under certain regularity conditions on φ.

Original languageEnglish
Pages (from-to)855-863
Number of pages9
JournalComplex Variables and Elliptic Equations
Issue number9
Publication statusPublished - Sept 2009


  • Bloch function
  • Chordal distance
  • Meromorphic function
  • Normal family
  • Normal function
  • Spherical derivative
  • Unit disc

ASJC Scopus subject areas

  • Analysis
  • Numerical Analysis
  • Computational Mathematics
  • Applied Mathematics


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