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ลองทำแล้วไม่ออก

1) Let C be a nonempty compact convex subset of a Banach space E and
 S= {T(t) : t ≥ 0} be a semigroup of asymptotically nonexpansive mappings on C, then the
set of common fixed points F(S) of  is nonempty.

2) Let C be a nonempty compact convex subset of a Banach space E. Let
 S= {T(t) : t ∈ G} be an amenable semigroup of nonexpansive mappings on C. Then C
contains a common fixed point for S