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# Michael Strayer (UNC-CH), GMA Seminar

## January 23, 2017 @ 4:00 pm - 5:00 pm

**Title:** $d$-complete Posets and Representations of Lie Algebras

**Abstract:** In the first part of this talk, I will give the definition of $d$-complete poset as well as some of the basic properties. This will be in the context of general, “uncolored” $d$-complete posets. One particularly interesting result generalizes the famous “hook length formula” for counting the dimension of an irreducible representation of the symmetric group corresponding to a certain Young diagram. This part of the talk will be aimed toward first-year students, since representations of finite groups is a topic that comes up in the spring semester algebra class. The second part of the talk will be aimed more toward second-year students, as a number of them are taking Lie Algebras right now. In this part of the talk, I will introduce the notion of “coloring” a $d$-complete poset, and discuss how these (now colored) posets can completely describe certain “minuscule” representations of simple Lie algebras. I will provide all necessary definitions. If time remains, I will talk a bit about my research with Dr. Proctor.