This research monograph provides a geometric description of holonomic differential systems in one or more variables. Stokes matrices form the extended monodromy

We introduce mixed twistor D-modules and establish their fundamental functorial properties. We also prove that they can be described as the gluing of admissible

A detailed and unified treatment of $P$-adic differential equations, from the basic principles to the current frontiers of research.

This is the seventh volume of the Handbook of Geometry and Topology of Singularities, a series that aims to provide an accessible account of the state of the ar

With many updates and additional exercises, the second edition of this book continues to provide readers with a gentle introduction to rough path analysis and r