I am trying to do the following thing but I am not sure whether this
is possible in sage (though I think it is in Mathematica)
Let's say I define a symbolic function
sage: f=function('f',x)
I would like to issue some command to "tell" sage what the derivative
of f is (for instance : g) so that the command
sage: diff(f)
would yield g
The purpose of this is to use this unknown function in a more complex
derivation scheme.
Any idea out there ?
Thanks for reading
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