# ElementaryRischDEX2(R, F)¶

do_param_RDE(f, h, lg, x, lk) solves parametric Risch differential equation, that is returns [y, [c1, ..., ck]] such that dy/dx + n df/dx y + c1 g1 + ... cn gn = h where y is in the is in field generated by lk and ci are constants or “failed” if there is no solution.
do_risch_DE(f, g, x, lk) returns [y, h, 0, b] such that dy/dx + df/dx y = h and b := h = g. The equation dy/dx + df/dx y = g has no solution in the field generated by lk if h \~~= g (y is a partial solution in that case).
risch_de_ext(n, f, g, x) returns [y, h, p, b] such that dy/dx + n df/dx y + exp(-nf)dp = h and b := h = g. The equation dy/dx + n df/dx y = g has no solution if h \~~= g (y is a partial solution in that case).