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- W4301593656 abstract "We study the appearance of notable interval structures -- lattices, modular lattices, distributive lattices, and boolean lattices -- in both the Bruhat and weak orders of Coxeter groups. We collect and expand upon known results for principal order ideals, including pattern characterizations and enumerations for the symmetric group. This segues naturally into a similar analysis for arbitrary intervals, although the results are less characterizing for the Bruhat order at this generality. In counterpoint, however, we obtain a full characterization for intervals starting at rank one in the symmetric group, for each of the four structure types, in each of the two posets. Each category can be enumerated, with intriguing connections to Fibonacci and Catalan numbers. We conclude with suggestions for further directions and questions, including an interesting analysis of the intervals formed between a permutation and each generator in its support." @default.
- W4301593656 created "2022-10-05" @default.
- W4301593656 creator A5001438565 @default.
- W4301593656 date "2020-01-14" @default.
- W4301593656 modified "2023-09-27" @default.
- W4301593656 title "Interval structures in the Bruhat and weak orders" @default.
- W4301593656 doi "https://doi.org/10.48550/arxiv.2001.05011" @default.
- W4301593656 hasPublicationYear "2020" @default.
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