Mathematical Communications, cilt.14, sa.2, ss.299-305, 2009 (SCI-Expanded)
In this paper, we give some non-trivial generalizations of the Knopp core and statistical core theorems introduced by Knopp [Math. Z. 31 (1930) 97-127] and by Fridy and Orhan [J. Math. Anal. Appl. 208 (1997) 520-527], respectively. ©2009 Department of Mathematics, University of Osijek.