weak fixed point property

Using geometric properties to deal with the fixed point property of nonexpansive mapping in Banach spaces have being highly develpmented since Kirk proved that a Banach space with normal structure have weak fixed point property in 1965.
自從1965年，W. A. Kirk証明具有正槼結搆的Banach空間具有弱不動點性質10以來，利用Banach空間的空間性質研究非擴張映射的不動點性質得到了迅速的發展。