ON THE EXISTENCE OF FIXED POINTS FOR LIPSCHITZIAN SEMIGROUPS IN BANACH SPACES
2001
Let C be a nonempty bounded subset of a p-uniformly convex Banach space X, and T={T(t):t∈S} be a Lipschitzian semigroup on C with , where Np is the normal structure coefficient of X. Suppose also there exists a nonempty bounded closed convex subset E of C with the following properties: (P1)x ∈ E implies ωw(x)⊂ E; (P2)T is asymptotically regular on E. The authors prove that there exists a z∈E such that T(s)z=z for all s ∈ S. Further, under the similar condition, the existence of fixed points of Lipschitzian semigroups in a uniformly convex Banach space is discussed.
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