[Tex/LaTex] How to make a command for a composed symbol to work with all font sizes

font-metricsfontssymbols

In my paper I need a letter $\mathbb{R}$ with a small circle above it.
Currently I'm using the following command:
\newcommand{\obbR}{{\mbox{\kern1.4pt \raisebox{7pt} {\scriptsize$\circ$} \kern-9.1pt}\mathbb{R}}}
But unfortunately it works only with standard font size. The question is how to make a command for this "composed letter", which works with all font sizes.

Actually, I have two problems with writing of this "universal" command.
1. I don't know, how can one make values font-dependent.
2. I don't know, how can one make the small circle, I should put above R, smaller, than \scriptsize\circ.

Best Answer

I think you are looking for the \mathring accent. $\mathring{\mathbb{R}}$ should do what you want.

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[Tex/LaTex] How to fake mid-caps with LaTeX? (I.e. How to stretch characters of a font?)

I don't think I have a full answer but I found myself with a similar problem one day and solved it using bold versions of smaller fonts. For som fonts it works and for some it doesn't. This is where you skill and taste comes into effect. Here is my case where I think it works: (the \hskips are cause it's an abbreviation)

\documentclass[12pt]{memoir}
\usepackage[osf]{mathpazo}

\begin{document}
    \newcommand{\inchi}{%
                            \mbox{\textsc{i}%
        \hskip 0.1 em {\scriptsize \textbf{n}}%
        \hskip 0.1 em {\normalsize \textsc{c}}%
        \hskip 0.1 em {\scriptsize \textbf{h}}%
        \hskip 0.1 em {\normalsize \textsc{i}}%
        }
    }
    Lorem ipsum \inchi dolor\ldots
\end{document}

rendering of the code above

[Tex/LaTex] How to make a command for a circled letter to work with all font sizes

In this case using directly \mathchoice seems preferable:

\documentclass{article}
\usepackage{fix-cm} % make font arbitrarily scalable
\usepackage{amsmath}

\newcommand{\malcev}{\mathbin{
  \mathchoice
    {\mbox{\normalsize\textcircled{\scriptsize M}}}
    {\mbox{\normalsize\textcircled{\scriptsize M}}}
    {\mbox{\scriptsize\textcircled{\tiny M}}}
    {\mbox{\tiny\textcircled{\fontsize{3.5}{3.5}\selectfont M}}}
  }
}

\begin{document}
\[
\mathbf{V} \malcev \mathbf{W}  \qquad
F_{\mathbf{V} \malcev \mathbf{W}} \qquad
S^{\mathbf{V} \malcev \mathbf{W}^{\malcev}}
\]
\end{document}

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Best Answer

Related Solutions

[Tex/LaTex] How to fake mid-caps with LaTeX? (I.e. How to stretch characters of a font?)

[Tex/LaTex] How to make a command for a circled letter to work with all font sizes

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