#15710: sage hangs in division in cyclotomic field
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Reporter: ppurka | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: number fields | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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From the [https://spreadsheets.google.com/pub?key=pCwvGVwSMxTzT6E2xNdo5fA
google notebook bug reports]
{{{
# The computation of b below hangs.
q=49
F.<E>=CyclotomicField(q)
G = F['z,w'].fraction_field()
[z,w]=G.gens()
denom = (E-E^22)*(E-E^27)
print denom
print
recip=1/denom
print recip
print
a=w*recip
print a
print
b=w/denom
print b
print
recip=1/denom
print recip
print
a=w*recip
print a
print
b=w/denom
print b
}}}
''The attempt to evaluate b=w/denom hangs. But the reciprocal of the
denominator is not complicated: Sage has no trouble evaluating
recip=1/denom and then a=w*recip.''
''Note that z is not involved in this computation, just in the definition
in the field of rational functions.''
--
Ticket URL: <http://trac.sagemath.org/ticket/15710>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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