可缩空间(contractible space)与一点所成的空间有相同伦型的拓扑空间称为可缩空间，它是在同伦意义下最简单的一类空间，n维欧氏空间和它的凸子集都是可缩空间，而n维球面不是可缩空间。
他后来又解释道，这个空间的点睛处，在于它的灵活性：可回缩的墙体，可移动的舞台，还有可升降的观众席。
The beauty of the space, he explained, is its flexibility: the walls retract, the stage moves and the tiers of seats can be hoisted.
在H-空间中引入了可缩闭集的概念，得到了一个与C-KKM定理相平行的广义KKM定理。
In this paper a concept of contractible closed set is introduced in H-spaceand a generalized KKM theorem (Theorem 1)which is parallel with C-KKM theorem isobtained.
应用推荐