Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4655358 | Journal of Combinatorial Theory, Series A | 2014 | 15 Pages |
Abstract
By extending the notion of grid classes to include infinite grids, we establish a structural characterisation of the simple permutations in Av(4231,35142,42513,351624), a pattern class which has three different connections with algebraic geometry, including the specification of indices of Schubert varieties defined by inclusions. This characterisation leads to the enumeration of the class.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Discrete Mathematics and Combinatorics
Authors
Michael H. Albert, Robert Brignall,