For `DSolve[{y''[x] - 2 (y[x])^2 - y[x] == 0, y[0] == 0, y'[0] == 10^-4},
y[x], x]` I am getting `DSolve::bvimp: General solution contains implicit solutions. In the boundary value problem these solutions will be ignored, so some of the solutions will be lost. >>`
and output = {}
what does that mean??