##
In brief...

**I am** a (full) professor, incumbent of the **Gershon Kekst Professorial Chair**, working at the
Department
of Mathematics,
The Weizmann Institute
of Science.
**Professional interests** are best described by the following keywords:
**Hilbert 16th problem, limit
cycles, vector fields, foliations, singularities, Abelian integrals, bifurcations,
normal forms**.

If you read French, here is the poetic description of one
of my favorite problems:

. . . C'est ligne circulaire

Et courbe que ceci; je t'ordonne d'en faire

Ligne droite et sans nul retours.

Va-t'en y travailler, et cours.

Jean de Lafontaine, *La chose impossible*, 1674.

(Читающие по-русски могут найти
перевод здесь).

Favorite fields of Mathematics:
**(Ordinary) Differential Equations, Singularities, Geometry**. Go
to the **Research** section for more details.

**Courses** that I occasionally teach:

Differential geometry and topology (basic course),

Analytic
theory of ordinary differential equations.

Sporadic lecture notes can be found here.

This page is inherently rather static. A more dynamic site (with seminar news, links to new papers, conferences, lecture notes etc.) is available in the form of a **blog**.

**Advising students **is one of my favorite
occupations.

**Formal requirements** for studying in the
Weizmann Institute can be found
here.
Online application forms are also
available.