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These are questions asked by tijgertron

Hi, I'd like to substitute the expression A into B, where B is of the form


where a,b,c,p,q,r, are constants. The problem is: I only want the substitutions to be done outside of the unknown function f. So, if




I have an expression that involves an unknown function, say g:


where a, b and c are the coefficients I'm actually interested in. These coefficients are not constants but usually expressions in some constant parameters. The function g is an expression involving derivatives of some more fundamental function (in my problem).


expr:=(q/r-sqrt(2))*x[1] + x[2] - (w*r+4)*x[3] + D(G)(x[1]) - D(G)(x[3]);

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