DifferentialRoot

DifferentialRoot[lde][x] gives the holonomic function h(x), specified by the linear differential equation lde[h, x].

DifferentialRoot[lde] represents a pure holonomic function h.

Examples

DifferentialRoot[Function[{y, x}, {y''[x] + y[x] == 0, y[0] == 0, y'[0] == 1}]][x]

Please visit the official Wolfram Language Reference for more details.