SMS scnews item created by Kevin Coulembier at Tue 13 Feb 2018 1023
Type: Seminar
Distribution: World
Expiry: 24 Apr 2018
Calendar1: 23 Feb 2018 1200-1300
CalLoc1: Carlsaw 375
CalTitle1: Algebra Seminar: Some Reflections on Root Systems
Auth: kevinc@pkevinc.pc (assumed)

# Algebra Seminar: Graham -- Some Reflections on Root Systems

John Graham

Friday 23 February, 12-1pm, Place: Carslaw 375

Title: Some Reflections on Root Systems.

Abstract: Crystallographic finite and affine root systems are normally studied for their
applications to Lie theory.  To entertain myself while I was learning some programming,
I built a module to calculate with them following Bourbaki and Macdonald.  In the talk I
present some observations from this perspective that don’t seem to have made it to the
textbooks.  The themes are (1) concrete constructions; (2) the ignored non-reduced case;
and (3) folding and twisting.


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