Mardi 30 Septembre
Heure: 
14:00  17:00 
Lieu: 
Salle B107, bâtiment B, Université de Villetaneuse 
Résumé: 
Polynomials invariants on stranded graphs 
Description: 
Joseph Ben Geloun Tutte polynomial is a 2variable polynomial defined on a graph whichsatisfies a contraction/deletion recurrence relation. This polynomialgeneralizes into the socalled BollobasRiordan (4variable) polynomial forribbon graphs which also satisfies a similar recurrence rule. In the recentPhysics literature, there exists a growing interest for a new category ofgraphs called rank d stranded graphs. Such graphs encompass simple andribbon graph structures and represent simplicial complexes in any dimensiond. I will introduce a genuine 7variable polynomial on these graphstructures when restricted in rank 3 and when provided with a specificcoloring. The polynomial satisfies a new contraction/cut rule. The procedurecan be certainly extended in any rank. 

