
Evènement pour le groupe Combinatoire Énumérative et Algébrique
Date  20111125 10:4511:45 
Titre  Promising q,tNarayana polynomials 
Résumé  Some q,tCatalan polynomials are relatively famous polynomials symmetric in q and t that may be defined as an enumeration of Dyck paths of the same size according to two statistics.
These polynomials appear in various, sometimes more algebraic, contexts.
In a joint work with Mark Dukes, we were lead to the definition of a promising familly of q,tNarayana polynomials that may defined as an enumeration of parallelogram polyonominoes with the same bounding box according to two statistics.
It remains to place these polynomials in the litterature on the subject, but we can present a relatively natural path via the sandpile model between those two families of polynomials apparently both symmetric in q and t. 
Lieu  075 
Orateur  Yvan Le Borgne 
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