Résume | I'll review wall-crossing formalism (related to Stokes phenomenon)
for the integrals of exp(f/h) where f is a complex polynomial in
several variables, and h is a non-zero parameter thought of as a
"Planck constant". The formalism makes sense in infinite dimensions
whereas the integration is not defined. As an application one
obtains Gaiotto-Moore-Neitzke construction of solutions of
algebraic linear differential equations with small parameter. |