The fundamental group and higher homotopy groups
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From a channel a BrighterTube curator vetted · 80% confidenceFrom a channel Lumen includes in full: DanielChanMaths (UNSW mathematician Daniel Chan) posts complete university lecture courses in algebra, linear algebra, group theory and geometry.
A 30-minute video from DanielChanMaths's catalogue; the title names its topic.
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Part of Galois theory, the fundamental group and the etale topology