#18356: special resultants ``composed_sum`` and ``composed_product``
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Reporter: pernici | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.7
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/pernici/ticket/18356 | 5f888c83095eab89acbd96ee09e067918a60c258
Dependencies: | Stopgaps:
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Comment (by pernici):
Hello,
I made changes according to your comments:
4. The description corresponds to the monic form; now by default
the result of `composed_op` is in monic form.
5. Added the check that `p1` and `p2` are on the same polynomial ring.
6. Put `QQxy_with_gens` in place of `cached_QQ`.
7. Used `operator.add`, etc.
8. Moved the import statements.
9. Used `bool`.
10. Eliminated the `prec` argument in `newton_sum`.
Other changes:
previously `composed_op` returned a polynomial in `x` regardless
of the variable name of the input polynomials; fixing this gave
a speed-up of the "resultant" algorithm for small polynomials.
added some more checks on the input polynomials
eliminated the call to `integral` in the case of `operator.add`
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Ticket URL: <http://trac.sagemath.org/ticket/18356#comment:15>
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