An outline of obstruction theories of extensions via track categories
英文摘要：
Abelian track categories can be classified via the third Baues-Wirsching cohomology of small categories. This approach is used in this paper to compare and classify different generalisations of the obstruction theory of non-abelian group extensions, due to Cegarra, Garzón and Grandjean, Cegarra, Garzón and Ortega, and Chen, Du and Wang.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
