Bram Luyten schrieb:
> I was recently looking for a good resource on what's included in the unicode
> tables and what isn't.
> This one was one of the best I could find: http://barzilai.org/math_sym.htm
That's a nice overview, but only a small subset of available unicode 
characters (see http://www.unicode.org/charts/symbols.html).

> 
> But (repeating the previous posts), this doesn't cover all symbols necessary
> to express mathematical (or for example chemical) formulas.
> Especially when thinking about OAI, I'm really wondering if _any_ standards
> or agreements apply ?
> 
> Does anyone know how they do this in "big" reference repositories ?
In our library system there is a coding rule for the handling of sub- 
and superscripts. Carbon dioxide (HTML CO<sub>2</sub>) would be coded 
CO_2 and the Uranium Isotope 238 (HTML <sup>238</sup><sub>92</sup>U) as 
238_92_U. This is not useful for reading and understanding (because the 
coding results are ambiguous). But while coding the metadata this way it 
is possible to formulate (and transform) queries that can match the 
metadata.

> 
> Maybe I was just unlucky after looking for a few references, but it doesn't
> seem that these submissions in Arxiv include special symbols:
> http://arxiv.org/abs/0811.1165
> http://arxiv.org/abs/0811.0548
They use TeX and hope that anyone can understand it.

Best Greetings

Robert

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