#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 tscrim):
I agree with Nils on this, the silent changing of the base ring will cause
problems. However I can see (potential?) coercion confusion, so my thought
would be to raise an error (or warning?) anytime we are creating a
variable name that exists in the base ring. We also have to make sure we
handle cases like this too:
{{{
QQ['t']['s']['t']
}}}
So note that the first `t` is not one of the direct variables when
adjoining the second `t`.
--
Ticket URL: <http://trac.sagemath.org/ticket/16447#comment:2>
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