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arxiv: math/0506192 · v1 · submitted 2005-06-10 · 🧮 math.QA · math.CO

Une base sym\'etrique de l'alg\`ebre des coinvariants quasi-sym\'etriques

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keywords coinvariantsbasebasisquasi-symstabletriangulationscritdescribe
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We describe a new basis of the ring of quasi-symmetric coinvariants, which is stable by the natural reversal of the set of variables. The indexing set is the set of triangulations of a regular polygon, instead of the set of Dyck paths used for the known basis. On d\'{e}crit une nouvelle base de l'alg\`{e}bre des coinvariants quasi-sym\'{e}triques, qui est stable par l'involution naturelle et index\'{e}e par les triangulations d'un polygone r\'{e}gulier.

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