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 2010-07-18, 22:31 #3 ccorn     Apr 2010 2×3×52 Posts y = const. for any n; and if $y=y_1(x)$ is a solution, then $y=\alpha^{-(n+1)}y_1(\alpha x)$ is a solution too, for arbitrary $\alpha$ from the field of x. This does not help generalizing the solutions given so far, however. Last fiddled with by ccorn on 2010-07-18 at 22:33