#16447: do not use identical var names when constructing rings
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: commutative algebra | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
Consider
{{{
R=QQ['t']
S=R['t']
}}}
If this results in `S==Q['t1']['t2']` then `S.basering() != R`, and in
fact R will not coerce into `S`. That's really bad. Print names of
generators are part of the mathematical identity of an object in Sage. We
can't change what is supplied, since you wouldn't be producing what is
asked for.
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Ticket URL: <http://trac.sagemath.org/ticket/16447#comment:1>
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