Hi Alasdair,

On Thu, 20 May 2010 18:56:59 -0700 (PDT)
Alasdair <amc...@gmail.com> wrote:

> sage: diff(gamma(x))
>   gamma(x)*psi(x)
> sage: psi(1)
> 
> NameError: name 'psi' is not defined
> 
> Now is that cheeky or what - Sage giving an answer with a function
> which is "not defined"!

This was fixed a while ago, you should upgrade to the latest version.

http://trac.sagemath.org/sage_trac/ticket/6961

Let us know if you spot any other rogue functions. :)

Cheers,
Burcin

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