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math.CO2011
A Simple Bijective Proof of the Shape-Wilf-Equivalence of the Patterns 231 and 312
Jonathan Bloom, Dan Saracino
Stankova and West proved in 2002 that the patterns 231 and 312 are shape-Wilf-equivalent. Their proof was nonbijective and fairly complicated. We give a new characterization of 231…
math.CO2011
Modified Growth Diagrams, Permutation Pivots, and the BXW map
Jonathan Bloom, Dan Saracino
In their paper [1] on Wilf-equivalence for singleton classes, Backelin, Xin, and West introduce a transformation , defined by an iterative process and operating on (all) full…