#14504: finite field coercion fails for extended fields
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Reporter: llpamies | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone:
Component: PLEASE CHANGE | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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The following code works:
{{{
sage: ff.<x>=GF(4)
sage: ff(x+1)
}}}
However, if we try to get the element from an expression it fails:
{{{
sage: o=var('o')
sage: ff.<x>=GF(4)
sage: ff((x*o).coefficient(o))
TypeError: unable to coerce
}}}
This bug only happens for extended fields. You can try it by executing:
{{{
for fsize in [2,3,4,5,8]:
ff.<x>=GF(fsize)
o=var('o')
e=(x+1)*o
e.coefficient(o)
c = e.coefficient(o)
try:
print fsize, ff(c)
except:
print fsize, 'extended fields fail!'
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14504>
Sage <http://www.sagemath.org>
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