#7088: factoring certain polynomials over ZZ gets all mixed up (wrong constant)
via our PARI wrapper
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Reporter: was | Owner: somebody
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.1.2
Component: basic arithmetic | Keywords:
Reviewer: | Author:
Merged: |
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{{{
Hi all,
Found this simple bug in a simple Z[x] factoring example.
R.<x>=PolynomialRing(ZZ)
f = 12*x^10 + x^9 + 432*x^3 + 9011
g = 13*x^11 + 89*x^3 + 1
F = f^2 * g^3
G = F.factor()
should_be_zero = F - G.prod()
should_be_zero == 0
The problem was that F.factor returns
2028 * (12*x^10 + x^9 + 432*x^3 + 9011)^2 * (13*x^11 + 89*x^3 + 1)^3
Not 1 * (12*x^10 + x^9 + 432*x^3 + 9011)^2 * (13*x^11 + 89*x^3 + 1)^3
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7088>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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