#10682: sum fails with lower bound != 0 or 1 (upgrade maxima to 5.26)
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Reporter: fmaltey
| Owner: burcin
Type: defect
| Status: needs_work
Priority: critical
| Milestone: sage-5.0
Component: symbolics
| Keywords:
Work_issues: several doctests need to be patched due to changes in output
format/term order | Upstream: N/A
Reviewer:
| Author:
Merged:
| Dependencies:
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Comment(by kcrisman):
Replying to [comment:32 jpflori]:
> If we just rely on assumptions of the form 'x > 0', it should not be too
complicated to check that all variables are supposed to be real.
>
> Anyway, isn't there something in Maxima which "knows" that a variable is
real after such assumptions ?
If I understand correctly, Maxima and assumptions play weakly together.
They are ignored in a lot of "dummy variable" contexts like solving and
integration. So maybe here too.
Interestingly, our GSL numerical ODE solvers seem to only have real
domains (see [http://ask.sagemath.org/question/1156/ode_solver-unable-to-
convert-to-float this ask.sagemath.org question], I can't verify this
independently), so maybe we could instead just ''always'' change to
`domain:real` for ODE and then convert back when done... these are all
hacks, but some hacks are better than others.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10682#comment:33>
Sage <http://www.sagemath.org>
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