Notes for AKT-090910-2/0:15:44
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Definitions of positive and negative crossings and the writhe of an oriented knot diagram.
- Positive crossing: [math]\displaystyle{ \,\overcrossing\, }[/math]
- Negative crossing: [math]\displaystyle{ \,\undercrossing\, }[/math]
- The writhe of an oriented knot diagram is the sum of the signs of all the crossings in the diagram.
