Title: Hard Balls Gas and Alexandrov Spaces of Curvature Bounded Above

This lecture is an attempt to give a very elementary account of a circle of results (joint with S. Ferleger and A. Kononenko) in the theory of semi-dispersing billiard systems. These results heavily rely on the methods and ideology of the geometry of non-positively curved length spaces.

1991 Mathematics Subject Classification:

Keywords and Phrases:

Full text: dvi.gz 21 k, dvi 49 k, ps.gz 61 k.

Home Page of DOCUMENTA MATHEMATICA