道路连通:空间X是道路连通的,当且仅当对空间的任意两点x和y,存在从x到y道路p,也即,存在一个连续映射p: [0,1] → X
回答: chen01 平面有一条直线,每一点有一个切空间,所以直线上就外挂了一族的切空间。平时常说的partial,就。是这条直线到这族
由 marketreflections
于 2011-11-13 11:18:44
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