Noncommutative Free Cumulants
Séminaire lotharingien de combinatoire, 78B (2017)
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The relation between moments and free cumulants in free probability is essentially a compositional inversion. We lift it at the level of the noncommutative Faà di Bruno algebra, and of an operad of Schröder trees. We get a new formula for free cumulants in terms of trees, and we recover an interpretation of the relation in terms of characters due to Ebrahimi-Fard and Patras.
@article{SLC_2017_78B_a57,
author = {Matthieu Josuat-Verg\`es and Fr\'ed\'eric Menous and Jean-Christophe Novelli and Jean-Yves Thibon},
title = {Noncommutative {Free} {Cumulants}},
journal = {S\'eminaire lotharingien de combinatoire},
year = {2017},
volume = {78B},
url = {http://geodesic.mathdoc.fr/item/SLC_2017_78B_a57/}
}
Matthieu Josuat-Vergès; Frédéric Menous; Jean-Christophe Novelli; Jean-Yves Thibon. Noncommutative Free Cumulants. Séminaire lotharingien de combinatoire, 78B (2017). http://geodesic.mathdoc.fr/item/SLC_2017_78B_a57/