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论文摘要

Yoneda 完备度量空间范畴的完备性和余完备性

Completeness and cocompleteness of categories of Yoneda complete metric space

作者:陈金鑫(四川大学数学学院)

Author:CHEN Jin-Xin(School of Mathematics, Sichuan University)

收稿日期:2019-03-02          年卷(期)页码:2020,57(2):205-210

期刊名称:四川大学学报: 自然科学版

Journal Name:Journal of Sichuan University (Natural Science Edition)

关键字:度量空间; Yoneda 完备; 完备范畴; 余完备范畴

Key words:Metric space; Yoneda complete; Complete category; Cocomplete category

基金项目:国家自然科学基金(11871358)

中文摘要

本文章探讨了以 Yoneda 完备度量空间范畴的完备性和余完备性, 证明:若态射是 Yoneda 连续映射或者 Yoneda 连续的非扩张映射, 则该范畴是完备且余完备的; 若态射是 Yoneda 连续的 Lipschitz 映射, 则该范畴是有限完备和有限余完备的, 但既不完备也不余完备. 本文还证明了以实数值连续格为对象, Yoneda 连续的右伴为态射的范畴是完备的.

英文摘要

This paper investigates the completeness and cocompleteness of some categories of Yoneda complete metric spaces. It is shown that if the morphisms are chosen to be Yoneda continuous maps or Yoneda continuous nonexpansive maps, then the category is both complete and cocomplete; if the morphisms are chosen to be Yoneda continuous Lipschitz maps, then the category is finitely complete and finitely cocomplete, but neither complete nor cocomplete. It is also shown the category of real-valued continuous lattice and Yoneda continuous right adjoints is complete.

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