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Re: [css3-background] Preparing for Last Call

From: Øyvind Stenhaug <oyvinds@opera.com>
Date: Wed, 07 Oct 2009 13:28:03 +0200
To: www-style@w3.org
Message-ID: <op.u1fgs1j0bunlto@oyvinds-desktop>
On Tue, 06 Oct 2009 21:54:50 +0200, fantasai  
<fantasai.lists@inkedblade.net> wrote:

>> Formula
>>  The latest editor's draft created one undefined case, viz., when the  
>> image is wider than 200% of the background positioning area. In that  
>> case, round(W/X) evaluates to 0 and the formula thus contains a  
>> division by zero.
>
> The draft explicitly defines round() in this formula to return the  
> nearest *natural* number rather than the nearest whole number, so it
> will never evaluate to zero.

Although I remember being taught that the set of natural numbers is the  
set of all (non-zero) positive integers, there apparently exists a second  
convention which includes 0 (see e.g.  
<http://mathworld.wolfram.com/NaturalNumber.html>).

Personally I don't find it immediately obvious that "positive integer"  
excludes zero either, so I would suggest replacing "natural number" with  
something like "non-zero natural number" or "integer > 0".

-- 
Øyvind Stenhaug
Core Norway, Opera Software ASA
Received on Wednesday, 7 October 2009 11:28:41 GMT

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