Dr Shane O'Rourke (CIT)

will speak on

Affine length functions and actions on non-archimedean trees

Time: 4:00PM
Date: Mon 22nd February 2010
Location: Mathematical Sciences Seminar Room [map]

Abstract: We attempt to unify the theories of (1) isometric actions on
Lambda-trees (where Lambda is a linearly ordered abelian group), and particularly based length functions associated with such actions; and (2) affine actions on R-trees, as studied by I. Liousse.

While much of these theories can be carried over to this new setting, we will describe some of the interesting examples of groups that have (fixed-point) free affine actions, but which do not admit actions as in (1) or (2) above.

(This talk is part of the Algebra and Number Theory series.)

PDF notice

Return to all seminars