Nieminen Juha wrote in message <37cfb224@news.povray.org>...
>Lance Birch <lan### [at] usanet> wrote:
>:                   x - y = 0
>
>:                   1(x - y) = 2(x - y)
>
>: Dividing both sides by (x - y):
>
>  You can't do it, since by definition x-y = 0. That would result in a
>division (x-y)/(x-y) which is 0/0 which is not defined.


Actually, under some circumstances it is defined.  For example, lim x->0
(x/x)

Mark

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