#10483: Deprecate the misuse of symbolic variables as polynomial variable
-----------------------------------+----------------------------------------
Reporter: SimonKing | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.6.1
Component: basic arithmetic | Keywords: deprecation symbolic
polynomial variable
Author: Simon King | Upstream: N/A
Reviewer: Karl-Dieter Crisman | Merged:
Work_issues: |
-----------------------------------+----------------------------------------
Changes (by kcrisman):
* reviewer: => Karl-Dieter Crisman
Comment:
I'm just saying that the "of course is not the case" is not at all "of
course" to me. Current behavior:
{{{
sage: P = QQ[x]
sage: P.gen()
x
sage: P.gen() == x
x == x
sage: bool(P.gen() == x)
True
sage: P.gen() is x
False
}}}
So unless you think to do the last thing, that is pretty confusing - they
have identical representation methods. Which is of course why you want to
change this, and introduce the deprecation.
So maybe you could say
{{{
... resulting polynomial ring. However, this was not the case; the
generator of a polynomial ring is always a polynomial type, not a symbolic
expression, so although they have the same representation, they are not
the same. This explains the following warning:
<deprecation warning doctest
}}}
Does that make any sense?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10483#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
