Hi, I have a long expression (differential polynomial).

It may contain different functions a(x,y), b(x,y), c(x,y) and its derrivatives.

Visually i do not see variable a (and its derivative) in expression.

But I want to be sure. How can I check it automatically?

Also I don't know maximal order of derivative that could appear in this expression.

Hi All,

I need to generate WienerProcess(), but I want to get result as function Z(t).

Then I want to use this function in solving ODE. How is it possible to do?

Let say I want to generate polynomail with unknown coefficients of variable (x,y,z,t,s) of 3-th order (NOT RANDOM ONE!).