#6428: Large exponents overflow to negative in polydict ring
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Reporter: broune | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone:
Component: algebra | Keywords:
Reviewer: | Author:
Merged: |
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Old description:
> Large exponents overflow to negative in polydict ring:
>
> sage: from sage.rings.polynomial.multi_polynomial_ring import \
> ... MPolynomialRing_polydict
> sage: ring = MPolynomialRing_polydict(ZZ, 3, ['a','b','c'], "lex")
> sage: a = ring.gens()[0]
>
> sage: a^(2^31-1)
> a^2147483647
>
> sage: a^(2^31)
> a^-2147483648
>
> sage: a^(2^32)
> 1
New description:
Large exponents overflow to negative in polydict ring:
{{{
sage: from sage.rings.polynomial.multi_polynomial_ring import \
... MPolynomialRing_polydict
sage: ring = MPolynomialRing_polydict(ZZ, 3, ['a','b','c'], "lex")
sage: a = ring.gens()[0]
sage: a^(2^31-1)
a^2147483647
sage: a^(2^31)
a^-2147483648
sage: a^(2^32)
1
}}}
--
Comment(by broune):
Fixed layout.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6428#comment:1>
Sage <http://sagemath.org/>
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