Does anybody know any books or websites where I cand find the proof of Seifert- van Kampen theorem using generators and relators? I've been reading the proof in Kosniowski's algebraic topology, but I would like to have another versión, and if it is done for an arbitrary open cover (not just with two elements), much better. Thanks in advanced!
2026-04-08 16:28:14.1775665694
Where can I find the proof of Seifert-van Kampen using generators and relations?
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