#7085: fix this laurent series coercion bug
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Reporter: was | Owner: somebody
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.1
Component: basic arithmetic | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by mhampton):
Before any division takes place, z is getting incorrectly coerced to w. I
think this is because in laurent_series_ring_element.pyx, in the
LaurentSeries class __init__ method the represention (variable)^n*f is
shifted by the code:
{{{
else:
val = f.valuation()
if val == 0:
self.__n = n # power of the variable
self.__u = f # unit part
else:
self.__n = n + val
self.__u = f >> val
}}}
and I think that shifting is missing that different variables are
involved.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7085#comment:2>
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