Some topological extensions of plane geometry
Some topological extensions of plane geometry
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平面几何的一些拓扑扩展
DOI:
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发表时间:
1975
期刊:
影响因子:
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通讯作者:
H. Bell
中科院分区:
文献类型:
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作者:
H. Bell
Let A be a closed subset of the plane. For a point b in the plane whose distance to A is d(b,A) let S(b,A) = {z : |z-b| d (b,A)}. Let E(A) be the set of points e for which S(b,A) ∩ A has at least two points. Let f (A) be the set of open intervals (a,b) for which there is an e ℇ E(A) and a component of S(e,A)-A with endpoints a and b. The sets E(A) and f (A) are the central tools in this paper.