Some universal constructions in abstract topological dynamics
Abstract
This small survey of basic universal constructions related to the actions of topological groups on compacta is centred around a new result  an intrinsic description of extremely amenable topological groups (i.e., those having a fixed point in each compactum they act upon), solving a 1967 problem by Granirer. Another old problem whose solution (in the negative) is noted here, is a 1957 conjecture by Teleman on irreducible representations of general topological groups. Our exposition covers the greatest ambit and the universal minimal flow, as well as closely related constructions and results from representation theory. We present in a simplified fashion the known examples of extremely amenable groups and discuss their relationship with a 1969 problem by Ellis. Open questions, including those from bordering disciplines, are reviewed along the way.
 Publication:

arXiv eprints
 Pub Date:
 May 1997
 DOI:
 10.48550/arXiv.functan/9705003
 arXiv:
 arXiv:functan/9705003
 Bibcode:
 1997funct.an..5003P
 Keywords:

 Mathematics  Functional Analysis;
 43A07;
 43A65;
 54H20
 EPrint:
 AMSTeX 2.1, 18 pages