#20102: test fixed series expansion of powers of functions at poles
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Reporter: behackl | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: symbolics | Resolution:
Keywords: pynac | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: pynac-0.6.3 | Stopgaps:
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Description changed by behackl:
Old description:
> Currently we have the following behavior:
> {{{
> sage: (gamma(x)^2).series(x==0, 2)
> Traceback (most recent call last):
> ...
> ValueError: psi_eval(): simple pole
> sage: (zeta(x)^2).series(x==1, 2)
> (Infinity) + (Infinity)*(x - 1) + Order((x - 1)^2)
> sage: (tan(x)^2).series(x==pi/2, 2)
> (Infinity) + (Infinity)*(-1/2*pi + x) + Order(1/4*(pi - 2*x)^2)
> }}}
>
> This is fixed in the current development version of pynac. This ticket
> shall add corresponding doctests.
New description:
Currently we have the following behavior:
{{{
sage: (gamma(x)^2).series(x==0, 2)
Traceback (most recent call last):
...
ValueError: psi_eval(): simple pole
sage: (zeta(x)^2).series(x==1, 2)
(Infinity) + (Infinity)*(x - 1) + Order((x - 1)^2)
sage: (tan(x)^2).series(x==pi/2, 2)
(Infinity) + (Infinity)*(-1/2*pi + x) + Order(1/4*(pi - 2*x)^2)
}}}
This is fixed in the current development version of pynac, see
https://github.com/pynac/pynac/issues/135. This ticket shall add
corresponding doctests.
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Ticket URL: <http://trac.sagemath.org/ticket/20102#comment:1>
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