#12749: Raise algebras/free_algebra.py coverage to 100%
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Reporter: JStarx | Owner: mvngu
Type: enhancement | Status: needs_work
Priority: trivial | Milestone: sage-5.0
Component: doctest | Resolution:
Keywords: FreeAlgebra, doctest | Work issues: correct false
statement
Report Upstream: N/A | Reviewers:
Authors: Jim Stark | Merged in:
Dependencies: | Stopgaps:
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Changes (by davidloeffler):
* status: needs_review => needs_work
* work_issues: => correct false statement
Comment:
In the list of things coercing into a free algebra, you have
{{{
398 - Polynomial rings in the same variables over a
base with a coercion
399 map into self.base_ring()
}}}
This is false: a polynomial ring (in which the variables commute) does
not, and should not, coerce into a free algebra (in which they don't). Did
you mean "'''free algebras''' in the same variables..."?
{{{
sage: F = FreeAlgebra(ZZ, 3, 'x,y,z')
sage: G = PolynomialRing(ZZ, 3, 'x,y,z')
sage: F.has_coerce_map_from(G)
False
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12749#comment:3>
Sage <http://www.sagemath.org>
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