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Constructive Hopf's Theorem: Or how to Untangle Closed Planar Curves/en-ca/constructive-hopfs-theorem-or-how-to-untangle-closed-planar-curves/A3727896-9568-4D27-A8E1-11A6E9F42F4B.htmlA3727896-9568-4D27-A8E1-11A6E9F42F4B
Constructive Hopf's Theorem: Or How To Untangle Closed Planar Curves