Among other topics, we highlight the following ones:
- Formal and analytic solutions for ordinary differential equations in the complex domain. Stokes multipliers.
- Formal and analytic solutions of other kinds of functional equations: difference, q-difference, differential-difference, moment-differential and PD equations.
- Summability of WKB solutions, singular perturbations problems.
- Asymptotic expansions, Borel summability.
- Algebraic study of solutions of differential equations and D-modules.