Enumerating indices of Schubert varieties defined by inclusions |
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Authors: | Michael H. Albert Robert Brignall |
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Affiliation: | 1. Department of Computer Science, University of Otago, New Zealand;2. Department of Mathematics and Statistics, The Open University, UK |
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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. |
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Keywords: | Schubert varieties Pattern classes Enumeration |
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