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Dror Bar-Natan

Meta-Groups, Meta-Bicrossed-Products, and the Alexander Polynomial
Vendredi, 29 Novembre, 2013 - 11:00 à 12:00
Résumé : 

I will define "meta-groups" and explain how one specific meta-group, which in itself is a "meta-bicrossed-product", gives rise to an "ultimate Alexander invariant" of tangles, that contains the Alexander polynomial (multivariable, if you wish), has extremely good composition properties, is evaluated in a topologically meaningful way, and is least-wasteful in a computational sense. If you believe in categorification, that’s a wonderful playground. http://www.math.toronto.edu/ drorbn...

Institution de l'orateur : 
Univ. Toronto / Univ. Genève
Thème de recherche : 
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