#18654: reduce Integer 0 in letterplace FreeAlgebra
---------------------------+----------------------------
Reporter: nantel | Owner:
Type: enhancement | Status: new
Priority: trivial | Milestone: sage-6.8
Component: algebra | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Would be nice the "reduce" method handle the Integer 0
It is not really a bug but one often built polynomials from Integer "0"
{{{
FreeA.<a,b> = FreeAlgebra(QQ, implementation='letterplace')
I = FreeA*[a+b]*FreeA
G=I.groebner_basis()
P=a*a*a*a
P.reduce(G)
︡{"stdout":"b*b*b*b\n"}︡
Q=P-P
Q
︡
{"stdout":"0\n"}︡
Q.reduce(G)
︡
{"stdout":"0\n"}︡
︠
Q=0
︡Q.reduce(G)
︡
{"stderr":"Error in lines 1-1\nTraceback (most recent call last):\n File
\"/projects/5d2319d7-b6e9-4ea8-984f-
57412ea9d711/.sagemathcloud/sage_server.py\", line 879, in execute\n
exec compile(block+'\\n', '', 'single') in namespace, locals\n File \"\",
line 1, in <module>\n File \"sage/structure/element.pyx\", line 431, in
sage.structure.element.Element.__getattr__
(build/cythonized/sage/structure/element.c:4644)\n return
getattr_from_other_class(self, P._abstract_element_class, name)\n File
\"sage/structure/misc.pyx\", line 259, in
sage.structure.misc.getattr_from_other_class
(build/cythonized/sage/structure/misc.c:1670)\n raise
dummy_attribute_error\nAttributeError: 'sage.rings.integer.Integer' object
has no attribute 'reduce'\n"}︡
︠}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18654>
Sage <http://www.sagemath.org>
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and MATLAB
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