#12967: bugs in comparisons between constants, wrapped pyobjects, infinity
-------------------------------------------------+-------------------------
Reporter: dkrenn | Owner: burcin
Type: defect | Status:
Priority: major | needs_work
Component: symbolics | Milestone: sage-6.8
Keywords: compare pi infinity bool | Resolution:
Authors: Travis Scrimshaw, Ralf | Merged in:
Stephan | Reviewers: Karl-
Report Upstream: Reported upstream. Developers | Dieter Crisman
acknowledge bug. | Work issues:
Branch: | Commit:
Dependencies: pynac-0.3.9.2 | Stopgaps:
-------------------------------------------------+-------------------------
Description changed by rws:
Old description:
> We have
> {{{
> sage: bool(pi<Infinity)
> False
> sage: bool(pi>Infinity)
> True
> }}}
> which is obviously wrong. It seems that the problem only occurs with
> {{{pi}}}, because the following give correct results
> {{{
> sage: bool(pi<2*pi)
> True
> sage: bool(2*pi<Infinity)
> True
> sage: bool(e<Infinity)
> True
> sage: bool(e<pi)
> True
> }}}
>
> This was reported on [https://groups.google.com/d/topic/sage-
> support/2GlgJKOfK3g/discussion sage-support] by Robert Samal.
>
> '''Apply''' [attachment:trac_12967-symbolic_ring-review.patch].
>
> See the discussion at https://groups.google.com/forum/?hl=en#!topic/sage-
> devel/Oip2hzvjFZQ
New description:
We have
{{{
sage: bool(pi<Infinity)
False
sage: bool(pi>Infinity)
True
}}}
which is obviously wrong. It seems that the problem only occurs with
{{{pi}}}, because the following give correct results
{{{
sage: bool(pi<2*pi)
True
sage: bool(2*pi<Infinity)
True
sage: bool(e<Infinity)
True
sage: bool(e<pi)
True
}}}
This was reported on [https://groups.google.com/d/topic/sage-
support/2GlgJKOfK3g/discussion sage-support] by Robert Samal.
See the discussion at https://groups.google.com/forum/?hl=en#!topic/sage-
devel/Oip2hzvjFZQ
https://github.com/pynac/pynac/issues/69
---------------
Previously proposed patch: [attachment:trac_12967-symbolic_ring-
review.patch].
--
--
Ticket URL: <http://trac.sagemath.org/ticket/12967#comment:62>
Sage <http://www.sagemath.org>
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