File:Loop surface duality.svg
Summary
| Description |
English: Two surfaces, each with a counter-clockwise oriented boundary, are shown. The net number of times each boundary intersects the other surface is the same. The red boundary passes through the green surface in the preferred direction 2 times, and the green boundary passes through the red surface in the preferred direction 2 times. |
| Date | |
| Source | Own work |
| Author | Math buff |
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