| 平面中有界开集的边界的一个招扑性质 |
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| 引用本文： | 刘兆理. 平面中有界开集的边界的一个招扑性质[J]. 山东大学学报(理学版), 1994, 0(3) |
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| 作者姓名： | 刘兆理 |
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| 作者单位： | Dept.of Math.，Shandong Univ.，Jinan |
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| 摘 要： | 给出了有界开集的边界的一个拓扑性质：如果Ｄ是平面Ｒ２中原点的有界开邻域，那么其边界Ｄ中有一个连通分支与平面中从原点出发的任意射线都相交．
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| 关 键 词： | 有界开集；边界；拓扑性质 |
A TOPOLOGICAL PROPERTY OF BOUNDARIESOF BOUNDED OPEN SETS IN PLANE |
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| Liu Zhaoli. A TOPOLOGICAL PROPERTY OF BOUNDARIESOF BOUNDED OPEN SETS IN PLANE[J]. Journal of Shandong University, 1994, 0(3) |
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| Authors: | Liu Zhaoli |
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| Abstract: | The following theorem is proved:Theorem. Let D be a bounded open neighbourhood of the origin of R2,then the boundary D has a connected component which intersects every ray starting from the origin. |
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| Keywords: | bounded open set boundary topological property |
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