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Search: id:A141415
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| A141415 |
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Number of different virtual strings with n crossings. |
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+0
1
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OFFSET
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0,4
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COMMENT
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From Gibson, Table 2, p.14. Abstract: A virtual string can be defined as a closed curve on a surface modulo certain equivalence relations. Turaev defined several invariants of virtual strings which we use to produce a table of virtual strings up to 4 crossings. We discuss progress in extending the tabulation to 5 crossings. We also provide a counter-example to a statement of Kadokami.
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LINKS
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Andrew Gibson, On tabulating virtual strings
Vladimir Turaev, Virtual strings and their cobordisms
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CROSSREFS
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Sequence in context: A014050 A015214 A088816 this_sequence A056948 A035420 A022375
Adjacent sequences: A141412 A141413 A141414 this_sequence A141416 A141417 A141418
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KEYWORD
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more,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 04 2008
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