Re: udev and devfs - The final word

[Vojtech Pavlik]

On Mon, Jan 05, 2004 at 08:13:26AM -0800, Linus Torvalds wrote:

> But the thing is, some things you simply _cannot_ number. For example, a
> two-dimensional space is innumerable - you need more than one integer
> number to look things up.  So is the set of real numbers (but not the set 
> of fractions), etc etc.

Two dimensional discrete space (*) is enumerable. Just start at [0,0]
and assign numbers going around the center in a growing spiral (**).
That way you assign a number to every point in that space. This is very
similar to the trick used to demonstrate fractions are enumerable.

(*)  The one where you can use two integers to look things up.
(**) Assuming the coordinates can be negative. For non-negative
     it's even easier.

-- 
Vojtech Pavlik
SuSE Labs, SuSE CR
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