From: Asmus Freytag (asmusf@ix.netcom.com)
Date: Fri Apr 15 2011 - 15:55:29 CDT
On 4/15/2011 12:46 PM, John W Kennedy wrote:
> On Apr 15, 2011, at 2:06 PM, Asmus Freytag wrote:
>>> For example, a/b might be written like that, but it might be written (still inline) with 'a' over 'b' and a horizontal stroke between. In addition, there is "a over b" which does not have such a stroke (but normally parenthesizes). So one might have a character telling that two parts should be grouped over each other.
>> Just FYI, that distinction is presentational, not semantic, where fractions are concerned.
> Actually, it's semantic:
>
> a+b
> ---
> c+d
>
> is not equal to:
>
> a+b/c+d
>
But in a notation like UTN#28 you would always employ parens. The layout
would drop superfluous parens (in the first case). Hence, the
distinction becomes presentational again. With parens, you get the
proper inline equivalent,
(a+b)/(c+d)
Remember, using semantic markup means that you have the ability to do
scoping (here by overloading the parens). That makes all the difference.
A./
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