SMS scnews item created by Eric Hester at Mon 8 Apr 2019 1300
Type: Seminar
Distribution: World
Expiry: 8 Jul 2019
Calendar1: 8 Apr 2019 1700-1800
CalLoc1: Carslaw 535A
CalTitle1: An Introduction to Bass-Serre Theory
Auth: erich@10.83.64.53 (ehes5653) in SMS-WASM

# MaPSS: Maths Postgraduate Seminar Series: Carol Badre -- An Introduction to Bass-Serre Theory

Hello all,

The next MaPSS talk of this semester will be at 17:00 on Monday 8th April in Carslaw
535. It’s a great opportunity to meet fellow postgrads, listen to an interesting talk,
and of course get some free pizza!

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Title: An Introduction to Bass-Serre Theory

Abstract: One of the most fundamental parts of geometric group theory is Bass-Serre
theory. Bass-Serre theory was introduced by Serre (and developed further by Bass) in
the 1970’s in order to understand how groups act on simplicial trees. This theory allows
for the extraction of information of the structure of a group from its action on a tree,
characterising free groups, amalgamated products and their generalisations as groups
acting on simplicial trees. Bass-Serre theory has inspired developments in the
accessibility of groups, JSJ decomposition of finitely presented groups, lattices in
automorphism groups of trees, as well as results in the world of CAT(0)-cube complexes
and R-trees. Today I will give a gentle introduction to Bass-Serre theory.

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See you there!

Details can also be found on the school’s new Postgraduate Society website:
http://www.maths.usyd.edu.au/u/MaPS/mapss.2019.html

Cheers,
Eric


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