)Given some differential operator "P" = "a""n"("x") ∂"n" + ... + "a"1("x") ∂1 + "a"0("x"), where "x" is a complex variable, "a""i"("x") are polynomials, the quotient module "M" = "A"1(C)/"A"1(C)"P" is closely linked to space of solutions of the differential equation
where "f" is some holomorphic function in C, say.The vector space consisting of the solutions of that equation is given by the space of homomorphisms of "D"-modules formula_2.