Keywords

#hopf_theorem

Hopf theorem

Topological degree is the only homotopy invariant of continuous maps to spheres

The Hopf theorem is a statement in differential topology, saying that the topological degree is the only homotopy invariant of continuous maps to spheres.

Sat 10th

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Poincaré–Hopf theorem Hopf theorem Lefschetz fixed-point theorem Heinz Hopf Hopf–Rinow theorem Killing–Hopf theorem Fixed-point index Hairy ball theorem Hopf algebra Hopf bifurcation
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