A counterexample to the article "On the fixed points of affine nonexpansive mappings"
نویسنده
چکیده
LetK be a nonempty, closed convex subset of a real Banach space E. Amapping T : K → K is said to be nonexpansive if ‖Tx−Ty‖ ≤ ‖x− y‖ for all x, y ∈ K . T is said to be affine if for each x, y ∈ K and 0 < λ < 1, T(λx+ (1− λ)y)= λTx+ (1− λ)Ty. In the main theorem of the above-referenced paper [2, Theorem 2.4], the author proves that when K is a nonempty, closed convex and bounded subset of E and T : K → K is a nonexpansive and affine mapping, then it has a fixed point in K . Here, we give an example to show that the mentioned theorem above is not correct.
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عنوان ژورنال:
- Int. J. Math. Mathematical Sciences
دوره 2006 شماره
صفحات -
تاریخ انتشار 2006