Virtual Poincar\'e polynomial of the link of a real algebraic variety
  The Euler characteristic of the link of a real algebraic variety is an interesting topological invariant in order to discuss local topological properties. We prove in the paper that an invariant stronger than the Euler Characteristic is well defined for the link of an algebraic variety: its virtual Poincar\'e polynomial. 
Goulwen Fichou (IRMAR), Masahiro Shiota
math.AG