In this paper,the necessary and sutlicient conditions for general one-step methoos to be exponentially fitted at q0∈C are given, A class of multtderivative hyb
Let {X, Xi;i≥1} be a sequence of i.i.d.r.v'.s, Z(t) =∑ti=1 Xi, t≥O.Consider the renewal process N(t) = inf{x; Z(x) > t}. In this paper we study the neces