Homotopy groups of spheres - Wikipedia

This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (September 2022) (Learn how and when to remove this template message) Illustration of how a 2-sphere can be wrapped twice around another 2-sphere. Edges should be identified. In the mathematical field of algebraic top

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球面のホモトピー群。表もあり。