SPS organises a seminar by Yash Lodha

Event From Date: 
Tuesday, 28 January 2020
Event End Date: 
Tuesday, 28 January 2020
Event Title: 
SPS organises a seminar by Yash Lodha
Event Details: 

School of Physical Sciences

Jawaharlal Nehru University, New Delhi

 

Title :  The von Neumann-Day problem for finitely presented groups

 

Speaker: Yash Lodha (EPFL, Lausanne)

 


Date:  28– January -2020

Time:   4:00 p.m, Tuesday

Venue: Seminar Room, SPS

 

Abstract : The so called von Neumann-Day problem asks if there exist nonamenable groups that do not contain nonabelian free subgroups. I will describe a recent solution to the problem for the class of torsion free finitely presented groups (joint with Justin Moore). The groups emerge as groups of homeomorphisms of the real line, and an encoding by means of continued fractions is used to prescribe certain combinatorial structure. This structure allows us to establish that the groups are finitely presented.