Homotopy

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Homotopy elements in the homotopy group π₂(S²) ≅ ℤ.

Roman Gassmann and Tabea Méndez suggested some improvements to my original ideas.
  1. Andreas Müller
  2. winding number
  3. vector field
  4. homotopy
  5. mapping spheres to spheres
  6. homotopy groups of sphere
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