Open AccessNew estimates for meromorphic functions
Author(s) -
Bülent Örnek Nafi
Publication year - 2021
Publication title -
publications de l'institut mathématique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.246
H-Index - 17
eISSN - 1820-7405
pISSN - 0350-1302
DOI - 10.2298/pim2123153o
Subject(s) - meromorphic function , boundary (topology) , mathematics , class (philosophy) , lemma (botany) , function (biology) , mathematical analysis , modulus , point (geometry) , pure mathematics , unit (ring theory) , geometry , computer science , ecology , poaceae , artificial intelligence , evolutionary biology , biology , mathematics education
A boundary version of the Schwarz lemma for meromorphic functions is investigated. For the function Inf(z) = 1/z +?? k=2 knck?2zk?2, belonging to the class of W, we estimate from below the modulus of the angular derivative of the function on the boundary point of the unit disc.