## Rigidity of Álvarez classes of Riemannian foliations

### Hiraku Nozawa - Tokyo

Xoves 28 de maio de 2009 ás 16:30 horas na aula 7

**Resumo:**
- Álvarez class is a cohomology class of degree 1 defined for a closed manifold M with a Riemannian foliation F whose nontriviality characterizes the minimality of F. We will explain about that every period of Álvarez class of (M, F) is an algebraic integer, if the structure Lie algebra of (M, F) is nilpotent.

©
Hiraku Nozawa.