刊名:Journal of Mathematical Analysis and Applications
出版年:2017
出版时间:15 March 2017
年:2017
卷:447
期:2
页码:705-715
全文大小:343 K
文摘
This is an examination of the structure of fixed point sets of locally nonexpansive mappings in various geodesic spaces. Among other things, it is shown that if G is a bounded connected open subset of a complete CAT(0) space X and if is continuous on a297ac"> and locally nonexpansive on G , then the condition d(u,T(u))<d(x,T(x)) for all bd4f06d34a19be6a7b0368495a3d15" title="Click to view the MathML source">u∈G and 86041a94" title="Click to view the MathML source">x∈∂G implies that the fixed point set of T is a nonempty closed convex subset of G. The following theorem is also consequence of one of our main results. Theorem. Let bd" title="Click to view the MathML source">(X,d) be a complete CAT(0) space which has the geodesic extension property and whose Alexandrov curvature is bounded below. Suppose G is a connected open subset of X , and suppose T:G→G is a locally nonexpansive mapping for which e5edc4337a654758d21a82910b2a"> and for which int(Fix(T))≠∅. Then 886299b2" title="Click to view the MathML source">Fix(T) is a closed convex subset of G , and moreover the sequence 863f4bfb" title="Click to view the MathML source">{Tn(x)} converges to a point of 886299b2" title="Click to view the MathML source">Fix(T) for each 88fa2729c1964890b" title="Click to view the MathML source">x∈G.