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> |
:Positive crossing: <math>\,\overcrossing\,</math> |
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:Negative crossing: <math>\undercrossing</math> |
: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. |
: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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Latest revision as of 14:38, 8 September 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.
