Abstract
In Chapter 6 we calculated the set [S1, S1] of homotopy classes of maps S1 → S1 and found that [S1, S1] = Z, which is an Abelian group. We can describe the group operation topologically as follows.
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© 2010 Springer-Verlag London Limited
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Crossley, M.D. (2010). Homotopy Groups. In: Essential Topology. Springer Undergraduate Mathematics Series. Springer, London. https://doi.org/10.1007/1-84628-194-6_8
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DOI: https://doi.org/10.1007/1-84628-194-6_8
Publisher Name: Springer, London
Print ISBN: 978-1-85233-782-7
Online ISBN: 978-1-84628-194-5
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