论文标题
阿贝尔群体的代数理论
Algebraic theory of abelian groups
论文作者
论文摘要
本文档旨在对与代数拓扑最相关的阿贝尔群体理论的各个部分进行独立的描述。尽管在处理张量产品，扭转产品和$ \ text {ext} $ groupt的处理中，它几乎纯粹是说明性的。
This document aims to give a self-contained account of the parts of abelian group theory that are most relevant for algebraic topology. It is almost purely expository, although there are some slightly unusual features in the treatment of tensor products, torsion products and $\text{Ext}$ groups.
