#12967: bugs in comparisons between constants, wrapped pyobjects, infinity
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Reporter: dkrenn | Owner: burcin
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.6
Component: symbolics | Resolution:
Keywords: compare pi | Merged in:
infinity bool | Reviewers: Karl-Dieter Crisman
Authors: Travis Scrimshaw, | Work issues:
Ralf Stephan | Commit:
Report Upstream: N/A | c5845f6b18d582807dafaaf60ad6a5c8017173f3
Branch: u/rws/12967-2 | Stopgaps:
Dependencies: #17984 |
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Comment (by mmezzarobba):
Replying to [comment:49 pbruin]:
> Only if you identify `RR` with the mathematical field '''R''' of real
numbers. If we are serious about presenting `RR` as a certain set of
numbers that is quite different from the mathematical field '''R''' (for
example, `Infinity in RR` already returns `True`), then we can just let
`pi in RR` return `False`, emphatically warn users about this, and say
that different methods are needed to decide if an expression represents a
mathematical real number.
Exactly. If we want consistency across Sage, then the semantics of `x in
RR` *cannot* be "`x` is a real number"; it must be "`x` is an element of
the parent `RR`" or something similar.
--
Ticket URL: <http://trac.sagemath.org/ticket/12967#comment:50>
Sage <http://www.sagemath.org>
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