combine Psi functions
Expressions involving Psi are combined as follows
where Q is a rational function, P a univariate polynomial and m and n are rationals.
This is done by applying the following recurrence and reflection formulae.
You can enter the command combine/Psi using either the 1-D or 2-D calling sequence. For example, combine(Psi(x) + Psi(1+x), Psi) is equivalent to combine⁡Ψ⁡x+Ψ⁡1+x,Ψ.
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