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Re: Change of function in an ODE


hello,

there is an straigthforward way to tell Mathematica to replace funtions
AND their derivatives in expressions/equations:

expr=r^4 R''''[r] + 2 r^3 R'''[r] - r^2 R''[r] + r R'[r] - L^4 r^4 R[r] == 0

expr/.Table[D[R[r]->r^2 Log[r] G[r],{r,i}],{i,0,4}]

which you can now try to solve..

christoph



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