PS:

On May 21, 10:05 am, Simon King <simon.k...@nuigalway.ie> wrote:
[snip]
> So, naively, my first guess was that the Gamma function is known as
> Gamma to Sage.

The latex name is in fact upper case:

  sage: latex(gamma(x))
  \Gamma\left(x\right)

>  So, if you want to work with "psi", whatever this is, then define it!

Or import it:
  sage: from sage.functions.other import psi
  sage: psi(4)
  -euler_gamma + 11/6

Cheers,
Simon

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