#19999: infinite recursion creating certain asymptotic expansion
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Reporter: dkrenn | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: asymptotic expansions | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by behackl):
I've tried to find the actual reason for this infinite loop. It turns out
that the entire poset structure breaks down after inserting `(-1)^x`:
{{{
sage: ex = 1 + (-1)^x
sage: s = ex.summands; s
poset((-1)^x, 1)
sage: print s.repr_full()
poset((-1)^x, 1)
+-- (-1)^x
| +-- predecessors: 1
| +-- successors: 1
+-- null
| +-- no predecessors
| +-- successors: 1
+-- 1
| +-- predecessors: (-1)^x, null
| +-- successors: (-1)^x, oo
+-- oo
| +-- predecessors: 1
| +-- no successors
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/19999#comment:2>
Sage <http://www.sagemath.org>
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