Notes for AKT-090910-2/0:15:44: Difference between revisions
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Definitions of positive and negative crossings and the writhe of an oriented knot diagram. |
Definitions of positive and negative crossings and the writhe of an oriented knot diagram. |
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:Positive crossing <math>:\overcrossing</math> |
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:Negative crossing <math>:\undercrossing</math> |
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:The <b>writhe</b> of an oriented knot diagram is the sum of the signs of all the crossings in the diagram. |
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Revision as of 23:45, 27 August 2011
Definitions of positive and negative crossings and the writhe of an oriented knot diagram.
- Positive crossing Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle :\overcrossing}
- Negative crossing Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle :\undercrossing}
- The writhe of an oriented knot diagram is the sum of the signs of all the crossings in the diagram.
