DifferentialRootReduce

DifferentialRootReduce[expr, x] attempts to reduce expr to a single DifferentialRoot object as a function of x.

DifferentialRootReduce[expr, {x, x0}] takes the initial conditions to be specified at x=x0.

Examples

Reduce a holonomic expression:

DifferentialRootReduce[Sin[x] + Cos[x], x]
(* DifferentialRoot[...] *)

With initial point:

DifferentialRootReduce[Exp[x], {x, 0}]

Please visit the official Wolfram Language Reference for more details.