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math.CO2009
Catalan numbers and relations
Filippo Disanto, Luca Ferrari, Renzo Pinzani +1
We define the notion of a Catalan pair (which is a pair of binary relations (S,R) satisfying certain axioms) with the aim of giving a common language to most of the combinatorial i…
math.CO2007★ 11 cited
Permutations defining convex permutominoes
A. Bernini, F. Disanto, R. Pinzani +1
A permutomino of size n is a polyomino determined by particular pairs (P1, P2) of permutations of size n, such that P1(i) is different from P2(i), for all i. Here we determine the…