2011Collectanea mathematicaOpen access

The structure of fixed-point sets of uniformly lipschitzian semigroups

Jarosław Górnicki

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Abstract

In this paper, by asymptotic center techniques, we shown that the set of fixed points of a uniformly k -lipschitzian semigroup (one-parameter or left reversible semi-topological) in a uniformly convex Banach space is a retract of the domain if k is close to 1. The results presented in this paper includes (among others, in the discrete situation) many known results as special cases.

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In this paper, by asymptotic center techniques, we shown that the set of fixed points of a uniformly k -lipschitzian semigroup (one-parameter or left reversible semi-topological) in a uniformly convex Banach space is a retract of the domain if k is close to 1. The results presented in this paper includes (among others, in the discrete situation) many known results as special cases.

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Available abstract

In this paper, by asymptotic center techniques, we shown that the set of fixed points of a uniformly k -lipschitzian semigroup (one-parameter or left reversible semi-topological) in a uniformly convex Banach space is a retract of the domain if k is close to 1. The results presented in this paper includes (among others, in the discrete situation) many known results as special cases.

Key concepts: Mathematics, Retract, Fixed point, Banach space, Semigroup, Regular polygon, Uniformly convex space, Pure mathematics

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