Counting Upper Interactions in Dyck Paths
Séminaire lotharingien de combinatoire, Tome 54 (2006-2007)
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Upper and lower interactions are parameters of Dyck paths which are motivated by corresponding parameters in a model of partially directed polymers. We investigate the problem of obtaining the generating function for Dyck paths with respect to upper interactions in terms of basic hypergeometric q-series in which an algebraic term occurs.