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## reduce-algebra-developers — Discussion of development, administration and support for Reduce

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 [Reduce-algebra-developers] An inconsistency in computing derivatives? From: Rainer Schöpf - 2011-09-01 17:21:25 ```Compare the following examples A) -------------------------------- 1: depend f,r; 2: depend r,x; 3: df(f,x); df(f,x) 4: on expanddf; 5: df(f,x); df(f,r)*df(r,x) -------------------------------- B) -------------------------------- 1: operator f; 2: depend r,x; 3: df(f(r),x); df(f(r),x) 4: on expanddf; 5: df(f(r),x); df(f(r),x) -------------------------------- With on expanddf, the chain rule is applied to the first example, but not to the second one. Shouldn't this be done as well? The second one is needed for the changevr package; this package redefines diffp to achieve it. (As an aside: the new switches like expanddf are not described in the manual; was this deliberate? If not, I'll update the documentation.) Rainer ```

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