Van Kampen theorems for categories of covering morphisms in lextensive categories

[摘要] We give a form of the Van Kampen Theorem involving covering morphisms in a lextensive category. This includes the usual results for covering maps of locally connected spaces, for light maps of compact Hausdorff spaces, and for locally strong separable algebras. (C) 1997 Elsevier Science B.V.

[发布日期] 1997-07-07