> -----Message d'origine-----
> De?: maxima-bounces at math.utexas.edu [mailto:maxima-bounces at math.utexas.edu] De la part de
> Richard Hennessy
> Envoy??: mercredi 8 septembre 2010 23:51
> ??: Richard Fateman
> Cc?: maxima at math.utexas.edu
> Objet?: Re: [Maxima] inf - inf = 0 ??
>
>
> --------------------------------------------------
> From: "Richard Fateman" <fateman at cs.berkeley.edu>
> Sent: Wednesday, September 08, 2010 4:54 PM
> To: "Richard Hennessy" <rich.hennessy at verizon.net>
> Cc: <maxima at math.utexas.edu>
> Subject: Re: [Maxima] inf - inf = 0 ??
>
> > On 9/8/2010 12:21 PM, Richard Hennessy wrote:
> >> I think the user should know better.
> > There is substantial evidence that this is not always true :)
> Agreed.
> I don't think trying to decide if this inf is the same infinity as that one (whatever that
> means assuming it can even be
> defined) is the issue.
>
> limit(expr1,x,a)-limit(expr2,x,a) is not always an operation on numbers, since it can be
> shown that infinity is not in
> the real number system or the complex number system. Perhaps the answer could be put in
> quotes when it is not a number.
>
> Rich
>
this mean that limit(expr1,x,a)-limit(expr2,x,a) is not equal to limit(expr1-expr2,x,a) ?
(I'm not mathematician it is why I ask this question)
>
> >
> > If an expression parses", something (meaningful, error, whatever) is computed.
> > And maybe returned.
> >
> > That includes inf-inf.
> >
> >
> >
>
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