#9555: Series expansions at singularities don't work
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Reporter: fredrik.johansson | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone:
Component: symbolics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by burcin):
Replying to [comment:7 kcrisman]:
> > The `taylor()` method is cruft left over from pre-pynac symbolics. We
should depreciate it in favor of the `series()` method.
>
> I don't know if I'd go that far. I think that especially the top-level
`taylor()` (which calls `SR.taylor()`) is very useful; having the top
command be `series()` is more confusing, as there are lots of series out
there.
OK. I can see the educational appeal of a `taylor()` method.
> That said, `SR.taylor()` should probably be calling Pynac at this point,
probably just the `.series()` method (without Puiseaux). I agree that
the code itself is cruft, just not the name :)
This would work, given the current behavior of Pynac/GiNaC's `series()`
function. It would cause problems in the future if that ever changes. We
should also add some doctests to make sure it only returns Taylor
expansions.
This can also be done as a part of #6119. Then, instead of a deprecation
message we give an error pointing to the `.series()` method.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9555#comment:8>
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