#11506: Fix the infinity ring.
-------------------------------------+-------------------------------------
Reporter: vbraun | Owner: AlexGhitza
Type: defect | Status: needs_info
Priority: blocker | Milestone: sage-6.3
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: Volker Braun | Reviewers: Peter Bruin
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vbraun/infinity_ring | 3531287276d95f0a60b762c4dc5475bee4860cba
Dependencies: #13125 | Stopgaps:
-------------------------------------+-------------------------------------
Changes (by tscrim):
* dependencies: 13125 => #13125
Comment:
IMO this makes things worse: a potential subtle bug is better than a
(generally) mathematically wrong answer. Irregardless, this is not a
coercion as it is not a ring morphism:
{{{
sage: RIF(0, oo) - RIF(0, oo)
[-infinity .. +infinity]
sage: InfinityRing(RIF(0, oo) - RIF(0, oo))
+Infinity
sage: InfinityRing(RIF(0, oo)) - InfinityRing(RIF(0, oo))
---------------------------------------------------------------------------
SignError Traceback (most recent call
last)
...
SignError: cannot add infinity to minus infinity
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/11506#comment:35>
Sage <http://www.sagemath.org>
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