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.
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