Two trivial high order PDEs

1. Jun 20, 2010

nick_ee

I should find the general solution of the two following trivial PDEs.

$$u=u(x_1,x_2,...,x_n)$$

1)

$$\frac{\partial u}{\partial x_1 \partial x_2} = 0$$

2)

$$\frac{\partial u}{\partial x_1} - u = 0$$

2. Jun 20, 2010

antibrane

What in particular are you having trouble with?

3. Jun 20, 2010

Staff: Mentor

What have you tried? Per forum rules, you need to show some effort at solving the problem.