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Events happening on November 3, 2015

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Nov. 03, 2015 10am (Math350)	Sarah Salmon (Colorado) X TBD A slow introduction to the Temperley--Lieb diagram algebra
Nov. 03, 2015 1pm (MATH 220)	Grad Algebra/Logic Ross Willard (University of Waterloo) X In congruence modular varieties, subdirectly irreducible algebras with abelian monolith are conveniently classified into `similarity' classes. For each class there is a unique simple module which can, in a certain sense, be identified with each monolith block of each member of the class. All of this has been known since the 1980s. In this lecture I will summarize part of this theory. Similarity and coordinatization in congruence modular varieties Sponsored by the Meyer Fund
Nov. 03, 2015 2pm (MATH 350)	Lie Theory Ed Green (Virginia Tech) X I will present a brief introduction to the theory of quivers, path algebras and theirquotients. The talk is designed for anyone having had a course in graduatealgebra. I will survey the basic theorems and ideas underlying current research in the representation theory of finite dimensional algebras. My next talk willdescribe some of my current research. An Introduction to the Representation Theory of Quivers with Relations
Nov. 03, 2015 2pm (MATH 220)	Ross Willard (University of Waterloo) X Dalmau’s algorithm solving CSPs over templates with a Maltsev polymorphism (generalized to templates with a cube polymorphism) is both beautiful (because it works) and terrible (because it cannot be further generalized). My current work aims to discover a new, radically different algorithm for CSPs over templates with a Maltsev polymorphism. So far all I’ve discovered is obstacles. In this lecture I will describe one intriguing obstacle which (I hope) coordinatization will resolve. Coordinatization in constraint networks over Maltsev templates Sponsored by the Meyer Fund
Nov. 03, 2015 3pm (Math 350)	Jordan Watts (CU Boulder) X Given a mechanical system, a technique often used to simplify calculations is to reduce the number of degrees of freedom of the system by removing symmetry, thereby creating a new system with lower dimension. More geometrically, given a Lie group and a Poisson manifold on which acts properly and via Poisson diffeomorphisms, the orbit space inherits a natural Poisson structure. We will prove this, and also see how the natural stratification of by orbit-type descends to the natural stratification of , but as a Poisson stratification; that is, the strata are Poisson submanifolds. This is not immediately obvious, since the strata upstairs on generally are not Poisson submanifolds. Poisson Reduction

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