FB 6 Mathematik/Informatik

Institut für Mathematik

Osnabrück University navigation and search

Main content

Top content

Current Lectures and Events

Advanced Applied Analysis Seminar for Degree Candidates

Advanced Stochastics Seminar for Degree Candidates

Advanced Algebra Seminar for Degree Candidates

16.04.2019 um 16:15 Uhr in 69/125:

Alexandros Grosdos Koutsoumpelias (Universität Osnabrück)

Combinatorial methods for algebraic problems in graphical models

Graphical models encode causal relations among random variables and find a range of applications in statistics. In the case of Gaussian random variables, the covariance matrix associated to the graph consists of rational functions in a polynomial ring. Goal of this talk is to shed light on algebraic questions related to the covariance matrix, such as finding its ideal or studying the fibers of the corresponding map. We present three combinatorial tools to do this, namely treks on graphs, graph decomposition and nested determinants.

Seminar of the Research Training Group "Combinatorial Structures in Geometry“