Abstract
The concept of sigma-convergence was introduced in [P. Schaefer, Proc. Amer. Math. Soc. 36(1972)104-110] by using invariant mean. In this paper we apply this method to prove some Korovkin type approximation theorems. [Mustafa Obaid. Some approximation theorems via sigma-convergence. Life Sci J 2012;9(4):1527-1530] (ISSN:1097-8135). http://www.lifesciencesite.com. 231