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环绕空间

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环绕空间环绕位形空间电子环绕空间是包围一个物体的空间。

数学

[编辑]

在数学上,特别是在几何学拓扑学,环绕空间是指包围某个数学对象的空间。例如,一条直线可以被独立的研究,或者是被放在二维空间中研究--在这种情况下环绕空间就是平面,或作为三维空间中的对象来研究--在这种情况下环绕空间就是三维的。为了搞明白这有什么不同,我们可以考虑这句话"永不相交的直线一定是相互平行的."。这句话在环绕空间是二维的情况下是对的,但在环绕空间是三维的情况下就是错的,因为在后一种情况下直线可以是相互歪斜的而不是平行的。

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环绕空间
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