# Mathematics Colloquia and Seminars

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### On the local structure of doubly laced crystals

**Algebra & Discrete Mathematics**

Speaker: | Philip Sternberg, UC Davis |

Location: | 2112 MSB |

Start time: | Thu, Apr 6 2006, 12:10PM |

Crystal bases, (or simplycrystals) are colored directed graphs with representation theoretic meaning. They were originally defined by finding a distinguished basis of a quotient of a quantum group module; since then many combinatorial characterizations of crystals have been given, all but one of them global in nature.

Stembridge (2003) provided a list of eight axioms, each of which addresses local properties of a graph, that characterizes crystal graphs for representations of simply laced algebras. He also conjectures a prescription for the local behavior of crystals for representations of doubly laced algebras. We confirm this conjecture, and discuss a possible approach to providing a characterization of these crystals.