Applications. 1965, 12 (1): 1–12. doi:10.1016/0022-247X(65)90049-1 . Kakutani, Shizuo. A generalization of Brouwer's fixed point theorem. Duke Mathematical
2^{S}} 为角谷映射。则 φ {\displaystyle \varphi } 存在不动点。 对应的单值函数定理是吉洪诺夫不动点定理。 Kakutani, Shizuo. A generalization of Brouwer's fixed point theorem. Duke Mathematical