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中文摘要：
设G为半群,C为具FrEchet可微范数的一致凸Banach空间X的非空有界闭凸子集.（■）={T_t：t∈G}为C上到自身的渐近非扩张型半群,且F（■）非空.在本文中,我们证明了：对■的任一殆轨道u（·）,■co{u（ts）,t∈G}∩F（S）至多为单点集.进一步,对x∈C,∩_（s∈G）co{T_（ts）x,t∈G}∩F（■）非空当且仅当存在C到F（■）上非扩张压缩P,使得对任意t∈G,PT_t=T_tP=P,Px∈co{T_tx,t∈G}.这一结果不仅推广了许多已知结果,而且说明它们中的一些关键条件是不必要的.
英文摘要：
Abstract Let G be a semigroup. Let C be a nonempty bounded closed convex subset of a uniformly convex Banach space X with a Fr@chet differentiable norm and = {T_t：t∈G} be a semigroup of asymptotically nonexpansive type mappings on C with Fco{u（ts）,t∈G}. We prove in this paper that for every almost orbit u（-） of S, NsEc do co{u（ts）,t∈G}∩F（S） consists of at most one point. Fhrther, [S]sEG do{Ttsx, t C G} N F（S） is nonempty for each x C C if and only if there exists a nonexpansive retraction P of C onto F（~） such that PTt =TtP = P for all t E G and Px E Co{Ttx, t C G}. This result not only gengneralizes some well-known theorems, but also shows that some key conditions in them are not necessary.
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