Crystals and coboundary categories

@inproceedings{Henriques2008CrystalsAC,
  title={Crystals and coboundary categories},
  author={Andr{\'e} Henriques and Joel Kamnitzer},
  year={2008}
}
Following an idea of A. Berenstein, we define a commutor for the category of crystals of a finite dimensional complex reductive Lie algebra. We show that this endows the category of crystals with the structure of a coboundary category. Similar to the role of the braid group in braided categories, a group naturally acts on multiple tensor products in coboundary categories. We call this group the cactus group and identify it as the fundamental group of the moduli space of marked real genus zero… CONTINUE READING
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