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A comment on Planet Hopf.
https://en.wikipedia.org/wiki/Hopf_fibration
Note this is due to Heinz Hopf, different from Eberhard (known for the Hopf bifurcation).
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https://en.wikipedia.org/wiki/Hopf_fibration
Note this is due to Heinz Hopf, different from Eberhard (known for the Hopf bifurcation).