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.
自从1965年，W. A. Kirk证明具有正规结构的Banach空间具有弱不动点性质10以来，利用Banach空间的空间性质研究非扩张映射的不动点性质得到了迅速的发展。