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ultranormal

Last-modified: 2010-05-15 (土) 23:49:58

定義 Edit

A topological space is ultranormal if any two disjoint closed subsets are contained in disjoint clopen subsets.

性質 Edit

注意 Edit

出典 Edit

Robert L. Ellis, Extending continuous functions on zero-dimensional spaces, Mathematische Annalen 186. http://www.springerlink.com/content/u545572g8u66652k/