Pure Mathematics
Ordinary differential equations in the complex domain. Formal and analytic solutions. Stokes multipliers.
Formal and analytic solutions of partial differential equations.
Formal and analytic solutions of difference equations (including q-difference and differential-difference equations). Special functions (hypergeometric functions and others), orthogonal polynomials, continuous and discrete Painlevé equations.
Integrable systems.
Holomorphic vector fields. Normal forms.
Asymptotic expansions, Borel summability.
Number theory, Analytical number theory, q-Calculus.
Schubert's Calculus, Intersection Theory.