Event Type:

Department Colloquium

Date/Time:

Monday, May 14, 2018 - 16:00 to 17:00

Location:

Kidder 350

Guest Speaker:

Institution:

Pomona College

Abstract:

We report on a fusion of two different strands of research from the early 2000s: NLDR (nonlinear dimensionality

reduction) and PCT (point-cloud topology). The two fields meet in theproblem of finding circular coordinates

(thus "angles") for a data set. This new technology has possible applications in signal processing and

dynamical systems.

The fusion comes about by using the NLDR approach with more general coordinates.

We find circle-valued coordinates (such as angles) by use of the persistence framework for

applying algebraic topology. I will indicate how these calculations are carried out, and give some examples

of how one can exploit the resulting coordinates to empirically study time-series data and

dynamical systems.

My collaborators in this work are Mikael Vejdemo-Johansson, Dmitriy Morozov, and Primoz Skraba.

Host: