#8232: cmp function for words is broken
-----------------------------+----------------------------------------------
Reporter: slabbe | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-4.3.3
Component: combinatorics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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As discussed on [http://groups.google.com/group/sage-combinat-
devel/browse_thread/thread/9e90bbeb0328034c| sage-combinat-devel], cmp is
broken for words.
{{{
Amusant: this boils down to:
sage: W = Words(['a','b','c'])
sage: W('a') == W([])
True
sage: W([]) == W('a')
False
}}}
it causes problem else where :
{{{
sage: A = AlgebrasWithBasis(QQ).example(); A
An example of an algebra with basis: the free algebra on the
generators ('a', 'b', 'c') over Rational Field
sage: [a,b,c] = A.algebra_generators()
sage: a.is_one()
True
sage: b.is_one()
True
sage: c.is_one()
True
sage: A.one().is_one()
True
sage: (a+b).is_one()
False
sage: (a+A.one()).is_one()
False
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8232>
Sage <http://www.sagemath.org>
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