Consider f: S(adsbygoogle = window.adsbygoogle || []).push({}); ^{1}-> S^{1}: (cos 2 pi x, sin 2 pi x) -> (cos 2 k pi x, sin 2 k pi x).

How to show directly from the homological definition (without using Hurewicz etc) that degree(f) = k?

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# Degree of a map

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