An invariant for open virtual strings

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Extended Alexander groups are used to define an invariant for open virtual strings. Examples of non-commuting open strings and a ribbon-concordance obstruction are given. An example is given of a slice virtual open string that is not ribbon. Definitions are extended to open n-strings.
9 pages, 10 figures. Version 2 includes improvements to section 3. To appear in J. Knot Theory and its Ramifications

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Geometric Topology, Primary 57M25; secondary 20F05, 20F34

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http://salesiana.dossiersoluciones.com/handle/123456789/72443

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0409185
 http://arxiv.org/abs/math/0409185

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arXiv