Help needed with Airy equation

1. Jul 9, 2009

ssatonreb

Hello!

I have difficulty to solve a PDE. I'm trying to simplify the third order eq. into the second order Airy equation. But I can't see where I could start. Could you, please, help me.
Where should I start?
Equations is:

$$\frac{\partial^{3}F(x,y)}{\partial y^{3}}-ix(y+C)\frac{\partial F(x,y)}{\partial y}=0$$

where C is positive constant $$i=\sqrt{-1}$$

Thank You.

2. Jul 9, 2009

g_edgar

$$F(x,y)$$ itself does not appear in the equation. So for example define $$G(x,y) = \partial F(x,y)/\partial y$$ to get a second-order equation for $$G$$ . Also, there are no derivatives $$\partial/\partial x$$, so we might as well consider it an ordinary differential equation.

3. Jul 9, 2009

ssatonreb

Thank You, but Airy equations is witten as f(y)''-y*f(y)=0.

How can I simplify eq. in order to -ix(y+C) become y?