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math.CO2014
A bijection between the irreducible k-shapes and the surjective pistols of height k-1
Ange Bigeni
This paper constructs a bijection between irreducible -shapes and surjective pistols of height , which carries the "free -sites" to the fixed points of surjective pistol…
math.CO2014
Combinatorial study of the Dellac configurations and the q-extended normalized median Genocchi numbers
Ange Bigeni
In two recent papers (\textit{Mathematical Research Letters,18(6):1163--1178,2011} and \textit{European J. Combin.,33(8):1913--1918,2012}), Feigin proved that the Poincaré polynomi…