Nov 15, 2019

Combinatorial and algorithmic aspects of CAT(0) complexes

Date: November 15, 2019 | 10:00 am – 11:00 am
Speaker: Hiroshi Hirai, University of Tokyo
Location: Mondi Seminar Room 3, Central Building

A CAT(0) space is a geodesic metric space having globally non positive curvature.
In this talk, I will discuss combinatorial and algorithmic aspects of
CAT(0) spaces associated with
combinatorial objects (graphs, posets, etc), from applied mathematics points of view.
Topics include:
(1) The space of phylogenetic trees (Billera, Holmes, Vogtmann 2001), and Owen-Provan algorithm (Owen, Provan 2011) computing the geodesic between two phylogenetic trees, via parametric network flow.
(2) Orthoscheme complexes associated with posets (Brady-McCammond 2010), classes of lattices/semilattices having CAT(0) orthoscheme complexes, and their application to sub-modular optimization.

More Information:

Date:
November 15, 2019
10:00 am – 11:00 am

Speaker:
Hiroshi Hirai, University of Tokyo

Location:
Mondi Seminar Room 3, Central Building

Contact:

HARPPRECHT Ksenja

Email:
kharppre@ist.ac.at

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