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This image illustrates the pushoff of a homology generator in the positive and negative directions of the Seifert surface for the figure eight knot.
I used gimp to draw it
(Reusing this file)
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|current||01:22, 14 October 2020||4,144 × 2,824 (1.34 MB)||Barelygaraidh||Uploading a self-made file using File Upload Wizard|