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04/27/12 12:37pm

Hi, I try to define Serie-like function but with product derivatives. I started with:

ProductNthDerivative[f_, l_] := E^D[Log[f], {l[[1]], l[[2]]}]

where f is an function, l is a list: {variable, derivative degree} (as D function).

I want to evaluate below function with three-element list l = {variable, point, degree} this way:

ProductSeries[f_, l_] := ...ProductNthDerivative[f, {l[[1],k}][l[[2]]]...

I know it won't work but it's just showing what I want to do. I cannot evaluate the function and simultanously append a value from input. What do I do? Thanks.

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