A dimension-lowering mappings theorem for Cf-spaces
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概要
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In this paper we prove the following theorem: If f : X → Y is an open mapping of a paracompact space X onto a Cf-space Y such that |f(-1)(y)| < ◆0 for every y ∈ Y, then X is a Cｆ-space.
- 埼玉大学教育学部の論文
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