Uniqueness of two analytic functions sharing four values in an angular domain

Hong-Yan Xu, Ting-Bin Cao
2010 Annales Polonici Mathematici  
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)].
doi:10.4064/ap99-1-5 fatcat:jm46632rrvbpzkek2vqx7nb2ky