3 papers
math.CO2009
Enumeration of alternating sign matrices of even size (quasi-)nvariant under a quarter-turn rotation
Jean-Christophe Aval, Philippe Duchon
The aim of this work is to enumerate alternating sign matrices (ASM) that are quasi-invariant under a quarter-turn. The enumeration formula (conjectured by Duchon) involves, as a p…
math.CO2009
Enumeration of alternating sign matrices of even size (quasi)-invariant under a quarter-turn rotation
Jean-Christophe Aval, Philippe Duchon
The aim of this work is to enumerate alternating sign matrices (ASM) that are quasi-invariant under a quarter-turn. The enumeration formula (conjectured by Duchon) involves, as a p…
math.CO2007
On the link pattern distribution of quarter-turn symmetric FPL configurations
Philippe Duchon
We present new conjectures on the distribution of link patterns for fully-packed loop (FPL) configurations that are invariant, or almost invariant, under a quarter turn rotation, e…