Uniqueness of two analytic functions sharing four values in an angular domain
Volume 99 / 2010
Annales Polonici Mathematici 99 (2010), 55-65 MSC: 30D30, 30D35. DOI: 10.4064/ap99-1-5
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)].