#11506: Fix the infinity ring.
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Reporter: vbraun | Owner: AlexGhitza
Type: defect | Status: needs_review
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 | cd9242959af9fda6d5351f8410889b36d6b6a392
Dependencies: 13125 | Stopgaps:
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Comment (by vbraun):
`unsigned_infinity in RR` returns true because there are coercions RR ->
signed infinity ring -> unsigned infinity ring:
{{{
sage: get_coercion_model().explain(unsigned_infinity, RR(oo), operator.eq)
Coercion on right operand via
Conversion map:
From: Real Field with 53 bits of precision
To: The Unsigned Infinity Ring
Arithmetic performed after coercions.
Result lives in The Unsigned Infinity Ring
The Unsigned Infinity Ring
}}}
We could disallow the conversion RR(unsigned_infinity) but it would not
change anything.
I agree with you that the infinity representation in CDF and CC sucks, but
thats another ticket...
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Ticket URL: <http://trac.sagemath.org/ticket/11506#comment:20>
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