alexa A Remark on the Hopf invariant for Spherical 4-braids

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A Remark on the Hopf invariant for Spherical 4-braids

An approach by J.Wu describes homotopy groups πn(S2) of the standard 2-sphere as isotopy classes of spherical n+1--strand Brunnian braids. The case n=3 is investigated for applications.

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