Re: math alphabets, WAS: Proprietary Card Decks

From: Asmus Freytag (
Date: Fri Apr 15 2011 - 15:55:29 CDT

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    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,


    Remember, using semantic markup means that you have the ability to do
    scoping (here by overloading the parens). That makes all the difference.


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