Avoiding Monotone Chains in Fillings of Layer Polyominoes
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
abstract
2016, Springer International Publishing. In this paper we give simple bijective proofs that the number of fillings of layer polyominoes with no northeast chains is the same as the number with no southeast chains. We consider 01-fillings and N-fillings and prove the results for both strong chains where the smallest rectangle containing the chain is also in the polyomino, and for regular chains where only the corners of the smallest rectangle containing the chain are required to be in the polyomino.