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@REPLYADDR Janis Papanagnou
<janis_papanagnou+ng@hotmail.com>
@REPLYTO 2:5075/128 Janis Papanagnou
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On 26.08.2023 03:52, Eli the Bearded wrote:
> In comp.unix.shell, Janis Papanagnou <
janis_papanagnou+ng@hotmail.com> wrote:
>> I`m replacing in a *.tex file (e.g.) `\\Omega` character definitions.
>>
>> In the Unicode tables I find a lot of different "Omegas`, but just
>> incoherent character set definitions and with different renderings
>> (depending on the output device some are taller, others are thiner).
>>
>> O (U+03A9) (Greek and Coptic sets; Range: 0370-03FF)
>> O (U+2126) ohm sign
>>
>> ? (U+1D6C0) bold
>> ? (U+1D6FA) italic
>> ? (U+1D734) bold italic
>> ? (U+1D76E) sans-serif bold
>> ? (U+1D7A8) sans-serif bold italic
>
> U+03A9 O GREEK CAPITAL LETTER OMEGA
> U+2126 Ohm OHM SIGN
> U+1D6C0 ? MATHEMATICAL BOLD CAPITAL OMEGA
> U+1D6FA ? MATHEMATICAL ITALIC CAPITAL OMEGA
> U+1D734 ? MATHEMATICAL BOLD ITALIC CAPITAL OMEGA
> U+1D76E ? MATHEMATICAL SANS-SERIF BOLD CAPITAL OMEGA
> U+1D7A8 ? MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL OMEGA
>
>> The first two are similar (or even the same?), the latter five seem
>> to have all the same dimensions (width/height) but there`s no plain
>> version in that set[*]; so if you mix bold or italic with the plain
>> character in a text it looks like garbage.
>
> The Greek one is the one to use for Greek text and for general "capital
> Omega". The ohm sign is to use for electronics. The others are all
> reserved for mathematical contexts where bold/italic/whatever is part of
> a symbol`s name not part of the overall document styling.
>
> I don`t know what \\Omega is in Tex, but I`m betting it is supposed to be
> the capital Greek letter.
In my case it`s a German text with occasional mathematical notations;
the \\Omega is part of the latter (the mathematical formulas) here.
>
>> What`s the rationale behind such incoherent character definitions?
>
> To the extent that Unicode has _variations_ on a character, those
> variations are meant to convey a different meaning. Mathematicians are
> just notorious for running out of symbols and ransacking other languages
> and/or making up new ones through "style" changes.
So the five mathematical variants have an own meaning each? - Okay, I
can`t tell. I still just wonder (if the are "running out of symbols"!)
why they don`t have a "plain" `MATHEMATICAL CAPITAL OMEGA` defined.
(In practice I am using the "GREEK CAPITAL LETTER OMEGA" now for the
mathematical formulas. Mixing with other "MATHEMATICAL ..." entities
looks a bit weird now with their differing sizes, but okay.)
Thanks to all who replied.
Janis
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