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From: Albert Retey on 12 Apr 2010 23:02
hi,

Am 12.04.2010 12:46, schrieb Christoph Lhotka:
> 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}]

expr /. R -> Function[{r}, r^2 Log[r] G[r]]

hth,

albert

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