## Lev Birbrair, Universidade Federal do Ceara, Brazil

Total positivity for real flag varieties

**
Thursday November 10, 2:30PM,
Herman Brown 227**
We consider singular algebraic or analytic sets as metric spaces and a question of bi-Lipschitz classification of these spaces. We present a complete solution of this question for surfaces, some invariants for higher dimensions and some relations of this theory with other areas of mathematics.