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2016-02-25 08:36:22 -0600 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

f1 = function('f1',latex_name = 'f_1')(x)

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

f1.derivative(x)

to output

f2(x)+ f3(x)