Mathematics Colloquia and Seminars
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Growth Series of Cyclotomic and Root LatticesAlgebra & Discrete Mathematics
|Speaker: ||Matthias Beck, San Francisco State University|
|Location: ||2112 MSB|
|Start time: ||Fri, Jun 5 2009, 2:10PM|
The coordination sequence of a lattice L encodes the word-length function
with respect to a fixed set of monoid generators of L. We investigate the
coordination sequences of cyclotomic lattices Z[zeta_m], where zeta_m is a
primitive m'th root of unity, and root lattices of type A, C, and D. Our
methods are based on unimodular triangulations of the contact polytope of
the lattice, the convex hull of the monoid generators, and combine results
from commutative algebra, number theory, and discrete geometry.
This is joint work with Federico Ardila (SF State), Serkan Hosten (SF
State), Julian Pfeifle (Barcelona), and Kim Seashore (Berkeley).