#16422: cancellation of two indefinite limits
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Reporter: dkrenn | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: symbolics | Resolution:
Keywords: symbolic, cancellation, | Merged in:
limit, indefinite | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Description changed by dkrenn:
Old description:
> We get
> {{{
> sage: limit(cos(x),x=oo) - limit(sin(x),x=oo)
> 0
> }}}
>
> This comes from the fact that the return value of each limit is a
> symbolic variable:
> {{{
> sage: limit(sin(x), x=oo)
> ind
> sage: type(limit(sin(x), x=oo))
> <type 'sage.symbolic.expression.Expression'>
> sage: limit(sin(x), x=oo).variables()
> (ind,)
> }}}
New description:
We get
{{{
sage: limit(cos(x),x=oo) - limit(sin(x),x=oo)
0
}}}
This comes from the fact that the return value of each of these limits is
a symbolic variable:
{{{
sage: limit(sin(x), x=oo)
ind
sage: type(limit(sin(x), x=oo))
<type 'sage.symbolic.expression.Expression'>
sage: limit(sin(x), x=oo).variables()
(ind,)
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/16422#comment:1>
Sage <http://www.sagemath.org>
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