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2016-02-25 15:36:22 +0200 | asked a question | Is it possible to define (or assume) the derivative of a function What i would like to do is define formal symbolic functions
and set their derivative or at least be able to substitute their derivative. As an example assume I defined f1,f2,f3,f4 then I would set dx f1 = f2+f3 and what I would expect is to output |

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