Algebra Seminar: Dyer -- Groupoids, root systems and weak order

There will be an algebra seminar on Friday 11 November, given by Matthew Dyer.  

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Speaker: Matthew Dyer (University of Notre Dame) 

Date: Friday 11 November 

Time: 12:05-12:55pm 

Venue: Carslaw 175 

Title: 

Groupoids, root systems and weak order

Abstract: 

Several (largely equivalent) points of view for notions of groupoid with root system
will be described.  They are obtained by abstracting basic properties of Coxeter groups,
such as the symmetric groups, with their root systems and weak orders.  This talk will
focus on examples and on aspects of the theory which generalize defining properties of
Coxeter groups, such as the exchange condition and their presentations by braid
relations.  

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Anne Thomas - anne.thomas@sydney.edu.au 
Seminar website - http://www.maths.usyd.edu.au/u/AlgebraSeminar/