#16031: Zero-test of constant expressions involving cancellation
---------------------------+----------------------------
Reporter: mmezzarobba | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.2
Component: symbolics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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{{{
sage: expr = 1/(1/(1/(1/(1/(1/(1/(1/(1/(1/(1/(1/(1/(1/(1/(pi - 3) - 7) -
15) - 1) - 292) - 1) - 1) - 1) - 2) - 1) - 3) - 1) - 14) - 2) - 1) - 1
sage: expr.is_zero()
...
RuntimeError: ECL says: Error executing code in Maxima: expt: undefined: 0
to a negative exponent.
sage: expr.normalize().is_zero()
...
RuntimeError: ECL says: Error executing code in Maxima: expt: undefined: 0
to a negative exponent.
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/16031>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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