Hi,

I have a PDE which I would like to group certain terms in common. They are all general functions and do not all share variables in common.

It is easier to explain in the script attached.

Any guidance anyone can offer would be greatly appreciated. 

Thank you 

question3.mw

Hi,

I am trying to substitute an general function pde expression I have derived in maple into another general function pde expression but cannot seem to find a method that works. 

Attached is an example worksheet - any help offered would be much appreciated.

Thanks 

question2.mw 

Hello,

To summarize, I have a variable ε = order(1),  which maple has assumed is a funtion ε(x,y,z) and so when I differentiate epsilon with respect to x (or y or z) I do not get 0. I get ε_x (or ε_y, ε_z). How do I ensure maple does not assume this?

More detail of my process:

I declare functions,

I have the function I want to transform,

Now I transform the variables to the new co-ordinate system. i.e. from (x,n,q) to (s,Y,z)

Good! - Everything correct so far. 

Now I want to linearise so i introduce x=x0+ε*x1; and the same for (Y,z), 

As you can see, epsilon has derivatives, which it should not. 

How I can avoid this? 

Thanks in advance - im well and truely stumped over this.

P.s. if the images do not show, the script can be found here: 

https://www.dropbox.com/sh/34gepa60xf4droq/AAAJlUcQ_Jwkc96topPvcxtXa?dl=0