I am studying the second chapter of this paper and even though I have a small experience with principal $G$-bundles I am struggling with some theorems that I have not seen so far. Is there a modern approach to this subject so that I can understand the chapter of the pdf? I suppose there should be an approach with model categories (I mean proving results for classifying spaces and principal bundles using model categories).
2026-03-26 08:05:23.1774512323
principal bundles references
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