Hyperfunctions; microfunctions; D-modules; functors associated with D-modules; holonomic D-modules; systems of microdifferential equations.
Kato\, Goro; Struppa\, Daniele C
"Provides a thorough introduction to the algebraic theory of systems of differential equations, as developed by the Japanese school of M. Sato and his colleagues. Features a complete review of hyperfunction-microfunction theory and the theory of D-modules. Strikes the perfect balance between analytic and algebraic aspects."