# Different \mathcal O

I would like to get a script O looking like this:

However, \mathcal O and \mathscr O give , which are slightly different.

This is not the pre-1992 \mathcal O.

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Old versions of Computer Modern mathcal was available in old versions of Latin Modern, but the O looks nothing like the one you are showing (the changes were minor, see what happened to the F). Your O is more like a variant of mathscr so you could look at "English Script" fonts on a site like myfonts to see if you find something similar (for example, English 111 is a bit closer). From which book(s) does it come from ? –  Philippe Goutet Dec 8 '11 at 6:00
Hartshorne's Algebraic Geometry uses it on page 69. It also appears in an old (pre-TeX) article (I'll try to upload a scan tomorrow) which also has a very exotic script A. –  Yuri Sulyma Dec 8 '11 at 6:58
OK, that's the script used on monotype machines which you can see in the books about monotype technology (e.g. Chaundy's The Printing of Mathematics or Monotype's List of Mathematical Characters for 4-line mathematics). I'm not sure it's available as a digital font, though. I'll upload a scan later on for you to see. Fonts called Commercial Script come close, but it's not quite that yet. –  Philippe Goutet Dec 8 '11 at 8:32
@YuriDelanghe This questions seems borderline for TeX.sx. As far as I can see, you want a particular font which we have no idea has ever been available as a TeX font. At the very least it would be useful to know the source of your graphic. –  Joseph Wright Dec 8 '11 at 8:46
@JosephWright Yes, I hadn't realized that Hartshorne might be non-TeX. –  Yuri Sulyma Dec 8 '11 at 18:14

\mathscr{O} from the euler package is thinner than the one from mathrsfs, which you obviously use:

\documentclass{standalone}
\usepackage{euler}
\begin{document}
$\mathscr{O}$
\end{document}

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Still different than the one above, though... I'm looking for that specific O. –  Yuri Sulyma Dec 8 '11 at 3:31
Then scan it, and insert the picture. Unless you can provide us some insight as to which font this is, there is not much we can do. –  Jean-Christophe Dubacq Dec 8 '11 at 10:22

Run with xelatex:

\documentclass{article}
\usepackage{amsmath}
\usepackage{unicode-math}
\setmathfont{STIX Math}
\begin{document}
\Huge $\mscrO$
\end{document}

amsmath is not needed here but it is always a good idea to load it and that must be done before unicode-math

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I had the same problem you had trying to get some equations out of Laeqed that uses TeX so I guess is the same.

In my case I discovered that the font by default was set to be Times New Roman, so I tried to change the font back to the standard one and when i compiled again the problem solved by itself and the $\mathscr{O}$ changed back to $\mathcal{O}$.

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