Proceedings of the 28-th International Conference on Formal Power Series and Algebraic Combinatorics
4-8 Jul 2016 Vancouver, British Columbia (Canada)

Extended abstracts listed by author > Schultze Adam

Tuesday 5
Combinatorics
Eric Fusy
› 17:30 - 19:00 (1h30)
› SFU Harbour Center - Segal Centre Conference Rooms 1400 - 1410
Combinatorial descriptions of the crystal structure on certain PBW bases
Ben Salisbury  1  , Adam Schultze  2  , Peter Tingley  3  
1 : Department of Mathematics, Central Michigan University, Mount Pleasant, MI
2 : Department of Mathematics and Statistics, State University of New York at Albany, Albany, NY
3 : Department of Mathematics and Statistics, Loyola University of Chicago, Chicago, IL

Lusztig's theory of PBW bases gives a way to realize the crystal B() for any simple complex Lie algebra where the underlying set consists of Kostant partitions. In fact, there are many different such realizations, one for each reduced expression for the longest element of the Weyl group. There is an algorithm to calculate the actions of the crystal operators, but it can be quite complicated. For ADE types, we give conditions on the reduced expression which ensure that the corresponding crystal operators are given by simple combinatorial bracketing rules. We then give at least one reduced expression satisfying our conditions in every type except E8, and discuss the resulting combinatorics. Finally, we describe the relationship with more standard tableaux combinatorics in types A and D



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