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Sphere with 2 points identified homotopy equivalence
Algebraic Topology - 13.3 - Homotopy Groups of Spheres Vanishing
Sphere as the quotient space of a disk
What is...homotopy of spheres?
Bouquet of circles and sphere with k punctures homotopy equivalence
Punctured torus homeomorphism
Solid torus without k points homotopy equivalence
Algebraic Topology 1: Homotopy Equivalence
Excision, applications (part 2)- Homology group of Spheres
Circle and punctured plane homotopy equivalence
Some spaces related to the sphere
The second homotopy group of the sphere: π₂(S²) in classical and digital topology
