#20490: Hash error with multivariate Laurent polynomial rings
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Reporter: tscrim | Owner: tscrim
Type: defect | Status: new
Priority: critical | Milestone: sage-7.2
Component: misc | Keywords: hash, multivariate Laurent
Merged in: | polynomials
Reviewers: | Authors:
Work issues: | Report Upstream: N/A
Commit: | Branch:
Stopgaps: | Dependencies:
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We do not have equality implying equality of hashes for multivariate
Laurent polynomial rings:
{{{
sage: R.<a,b> = LaurentPolynomialRing(ZZ)
sage: elt = (a + b) * (~a + ~b) - a*~b - ~a*b - 1
sage: elt == R.one()
True
sage: hash(elt) == hash(R.one())
False
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/20490>
Sage <http://www.sagemath.org>
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