#13645: PolynomialRing variables are not generic symbolic variables
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Reporter: llpamies | Owner: burcin
Type: defect | Status: needs_review
Priority: major | Milestone: sage-duplicate/invalid/wontfix
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Burcin Erocal
Authors: | Merged in:
Dependencies: | Stopgaps:
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Changes (by burcin):
* status: new => needs_review
* reviewer: => Burcin Erocal
* milestone: sage-5.4 => sage-duplicate/invalid/wontfix
Comment:
Here is what I get:
{{{
sage: poly.<a,b> = PolynomialRing(RR)
sage: solve([a+b+a*b == 1], a)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/burcin/sage/sage-5.2/<ipython console> in <module>()
/home/burcin/sage/sage-5.2/local/lib/python2.7/site-
packages/sage/symbolic/relation.pyc in solve(f, *args, **kwds)
676 for v in variables:
677 if not is_SymbolicVariable(v):
--> 678 raise TypeError, "%s is not a valid variable."%v
679
680 try:
TypeError: not all arguments converted during string formatting
}}}
Is this what you mean by a "crash"?
Note that when you work with variables in a polynomial ring, the
comparison is evaluated immediately.
{{{
sage: poly.<a,b> = PolynomialRing(RR)
sage: a+b+a*b == 1
False
}}}
In this case, the call to `solve` becomes `solve([False], a)`. The
comparison operator for polynomial rings is important (think monomial
orders and Groebner bases), we cannot change it to keep the relations
symbolic.
I suggest we close this as invalid.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13645#comment:1>
Sage <http://www.sagemath.org>
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