Am 08.04.2016 um 19:21 schrieb Jérôme M. Berger:

> 	There's a missing (2*..) in all formulas. It should be:
> 
> #declare Fn1X = function(x,y)
>   { (Fn(x+EPSILON,y)-Fn(x-EPSILON,y))/(2*EPSILON) }

Indeed. My bad.

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