Ange Bigeni

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In two recent papers, Feigin proved that the Poincaré polynomials of the degenerate flag varieties have a combinatorial interpretation through Dellac configurations, and related them to the q-extended normalized median Genocchi numbers ¯ c n (q) introduced by Han and Zeng, mainly by geometric considerations. In this paper, we give combinatorial proofs of(More)
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