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On strong convergence to common fixed points of nonexpansive semigroups in Hilbert spaces
Authors:Tomonari Suzuki
Affiliation:Department of Mathematics and Information Science, Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
Abstract:In this paper, we prove the following strong convergence theorem: Let $C$ be a closed convex subset of a Hilbert space $H$. Let ${ T(t) : t geq 0 }$ be a strongly continuous semigroup of nonexpansive mappings on $C$ such that $bigcap_{t geq 0} Fbig(T(t)big) neq emptyset$. Let ${ alpha_n }$ and ${ t_n }$ be sequences of real numbers satisfying $0 < alpha_n < 1$, $t_n > 0$ and $lim_n t_n = lim_n alpha_n / t_n = 0$. Fix $u in C$ and define a sequence ${ u_n }$ in $C$ by $ u_n = (1 - alpha_n) T(t_n) u_n + alpha_n u $ for $n in mathbb{N} $. Then ${ u_n }$ converges strongly to the element of $bigcap_{t geq 0} Fbig(T(t)big)$ nearest to $u$.

Keywords:Fixed point   nonexpansive semigroup
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