addressessymbols
I want a smaller "+" sign in international phone numbers. For example if I write
+1-123-456-7890
it gives
where "-" signs are all okay (not pretty though), but the "+" sign looks too big. How can I make it smaller? Is there any special symbol in LaTeX?
I am not too sure what font to use for the internal + and -, so I just used \hbox{\texttt{+}}. In TeX, each character has a \mathcode, describing its behavious in maths. All of them lie between "0000 and "7FFF (in hexadecimal), except the special mathcode "8000, which makes the character act like an active character. Within the group which \bra, \ket and \braket define, I get + and - to be active and expand to \braket@inner@minus and \braket@inner@plus.
\documentclass{article}
\usepackage{braket}
\makeatletter
\newcommand{\braket@inner@minus}{\hbox{\texttt{-}}}
\newcommand{\braket@inner@plus}{\hbox{\texttt{+}}}
\begingroup
\catcode`\-=13\relax %active
\catcode`\+=13\relax %active
\@firstofone{\endgroup %end the local changes to catcodes.
\newcommand\braket@inner@defs{%
\edef\restore@mathcode{%
\mathcode`\noexpand +=\the\mathcode`+%
\mathcode`\noexpand -=\the\mathcode`-%
}%
\mathcode`\+="8000\relax
\mathcode`\-="8000\relax
\def+{\begingroup\restore@mathcode\braket@inner@plus\endgroup}%
\def-{\begingroup\restore@mathcode\braket@inner@minus\endgroup}%
}%
}
% old definition:
% \newcommand{\bra}[1]{\mathinner {\langle {#1}|}}
% new definition:
\renewcommand{\bra}[1]{\mathinner {\langle \braket@inner@defs {#1}|}}
\renewcommand{\ket}[1]{\mathinner {|\braket@inner@defs{#1}\rangle }}
\renewcommand{\braket}[1]{\mathinner {\langle \braket@inner@defs {#1}\rangle }}
\makeatother
\begin{document}
\[
\bra{++--}A^\dag A\ket{-+-+} = \braket{++--|A^\dag A|-+-+} = \cdots
\]
However,
\[
\bra{++}(A+B)\ket{--} \neq \braket{++|(A+B)|--}
\]
\end{document}
The italic flat isn't prepared in the fonts. But if you really need it and you are using pdfTeX with direct output to PDF then you can try this:
\def\flatit{\setbox0=\hbox{$\flat$}%
\pdfliteral{q 1 0 .3 1 0 0 cm}\rlap{$\flat$}\pdfliteral{Q}\kern\wd0 }
{\it B\flatit C}
If you are not using pdfTeX with direct PDF output but you create PDF via (x)dvipdfm(x) (XeTeX chooses this way) then you can add the following definition:
\def\pdfliteral#1{\special{pdf:literal #1}}
Best Answer
An option could be to use + and - in monospaced font: