Stojan Radenovic1 and Mirjana Pavlovic2
1University of Belgrade, Faculty of Mechanical
Engineering,
27. marta 80, 11000 Belgrade, Serbia and Montenegro
2University of Kragujevac, Faculty of Science, Department
of Mathematics,
P.O.Box 60, 34000 Kragujevac, Serbia
and Montenegro
(Received August 5, 2002)
f satisfies (1) and (2) below, when k® +¥.