Re: help on math notation

In article <1130944311.070083.81430@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
<guillaume07@xxxxxxxxx> wrote:

>I'm a french boy , excuse for my approximative english ...
>
>I'm in trouble with a notation in mathematics:
>
>the x0 variable (where 0 is an indice of x). what's the meaning of this
>notation, it equal to x(0) ?

Depends on the context, but usually no.

It usually means a specific value for the variable x. For example, one
way to define the derivative at a point, called x0, would be to define
it as the limit, as x-->x0, of [f(x)-f(x0)]/[x-x0].

--
======================================================================
"It's not denial. I'm just very selective about
what I accept as reality."
--- Calvin ("Calvin and Hobbes")
======================================================================

Arturo Magidin
magidin@xxxxxxxxxxxxxxxxx

.

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