Uniqueness of two analytic functions sharing four values in an angular domain
Hong-Yan Xu, Ting-Bin Cao (2010)
Annales Polonici Mathematici
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We deal with the uniqueness problem for analytic functions sharing four distinct values in an angular domain and obtain some theorems which improve the result given by Cao and Yi [J. Math. Anal. Appl. 358 (2009)].