Re: [Dev-C++] How connect c++ to a database?

[Per W. <pw...@ia...>]

Was that a correction of something that I said?

The limit function (also known as limes, lim) when x reaches zero from the
negative side is -infinity, not infinity, and as I noted, it is
problematic to use limes to define the value of 1/0, since we don't like
the duality of 1/0 being both -infinity and +infinity. Hence it should
normally be treated as "undefined", at least when working with real-valued
numbers. Looking at 1/0 as +infinity is a simplification that should be
avoided.

/Per W

On Wed, 15 Feb 2006, Richard Van Wyk wrote:

> 1/x
>
> When considering x approaching zero from the negative side (-x),
> when we reach zero, 1/x becomes positive infinity.
> because there is no -0.
>
>
>
>
>
>
>
> Per Westermark <pw...@ia...>
> Sent by: dev...@li...
> 15/02/2006 04:13 PM
>
>
>         To:     "Daniel K. O." <dan...@ya...>
>         cc:     Dev-Cpp UserList <dev...@li...>
>         Subject:        Re: [Dev-C++] How connect c++ to a database?
>
>
> And that is why I observed that limes 1/x reaches different values when x
> reaches zero from positive and negative side, i.e. we either have to
> conclude that +infinity is identical to -infinity, or we have to think of
> 1/0 as just "undefined". In short, thinking of 1/0 as infinity is a
> simplification of the problem - my original point.
>
> When talking about division by zero in software-development terms, the
> IEEE 754 floating point standard defines:
> +n/0 -> +infinity
> -n/0 -> -infinity
> 0/0 -> not a number (NaN)
>
> /Per W
>
> On Wed, 15 Feb 2006, Daniel K. O. wrote:
>
> > This is IMHO the relevant quote:
> >
> > "Division by zero must be left undefined in any mathematical system that
> > obeys the axioms of a field
> > <http://en.wikipedia.org/wiki/Field_%28mathematics%29>."
> >
> > ---
> > Daniel K. O.