Scholarlink

A subset A of a space X is called a retract of XRetract if there is a map \(r : X \rightarrow A\) such that \(r|A = \textrm{id}\) , which is called a retraction.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Retracts and Extensors

  • 章节

  • 发表日期：

    2026年

查看全文
  • Katsuro Sakai

摘要

A subset A of a space X is called a retract of XRetract if there is a map \(r : X \rightarrow A\) such that \(r|A = \textrm{id}\) , which is called a retraction.