2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/68648We present an algorithm to construct a basis of k-th extension group of a D-module M in ring of the formal power series Ext_D^k(M,O).Algebraic GeometryAn Algorithm of Constructing Cohomological Series Solutions of Holonomic Systemstext