#10978: Resultant for polynomials over RDF and CDF not implemented
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Reporter: spice | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-4.7
Component: algebra | Keywords: polynomial, resultant
Author: Simon Spicer | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by spice):
I think I've tracked down the issue after some digging. From
rings/polynomial/polynomial_singular_interface.py/, class
Polynomial_singular_repr:
"Due to the incompatibility of Python extension classes and multiple
inheritance, this just defers to module-level functions."
This appears to be a Cython multiple inheritance issue - polynomials over
RDF and CDF are examples of the Polynomial_generic_field, which are
subclasses of Polynomial_singular_repr. The .resultant() method there
fails for these objects but the .resultant() method of the Polynomial
parent class (which does work) gets skipped overdue to the multiple
inheritance issue.
As such, this should be fixed in an upcoming version of Cython.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10978#comment:1>
Sage <http://www.sagemath.org>
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