capitalizationfontsizemath-modescalingsubscripts
Would it be possible to make subscripts in math mode automatically choose a smaller font when a subscript is in uppercase?
E.g., if I have sA, the "A" would appear quite big. Is it possible to tell the subscript operator _ to use a smaller font when it sees an uppercase letter?
A workaround is to define, say, \newcommand{\l}[1]{\scalebox{0.x}{$#1$}}. But I would like to see if what I desired can be made automatic?
As described here, Hatcher globally changes the positioning of sub- and superscripts. The code he provides is
\fontdimen16\textfont2=2.5pt
\fontdimen17\textfont2=2.5pt
\fontdimen14\textfont2=4.5pt
\fontdimen13\textfont2=4.5pt
I think the numbers here might be specific to the font he's using. Perhaps a font expert will comment on this?
Implementation for \E, which has optional sub- or superscripts before the mandatory argument. It uses \mleft and \mright to avoid additional horizontal spacing.
\documentclass{article}
\usepackage{mleftright}
\usepackage{amssymb}
\makeatletter
\newcommand*{\E}{%
\def\E@sub{}%
\def\E@sup{}%
\E@scripts
}
\newcommand*{\E@scripts}{%
\@ifnextchar_\E@subscript{%
\@ifnextchar^\E@supscript\E@finish
}%
}
\def\E@subscript_#1{%
\ifx\E@sub\@empty
\def\E@sub{#1}%
\else
\errmessage{E already has a subscript}%
\fi
\E@scripts
}
\def\E@supscript^#1{%
\ifx\E@sup\@empty
\def\E@sup{#1}%
\else
\errmessage{E already has a superscript}%
\fi
\E@scripts
}
\newcommand*{\E@finish}[1]{%
\mathbb{E}%
\ifx\E@sub\@empty\else _{\E@sub}\fi
\ifx\E@sup\@empty\else ^{\E@sup}\fi
\mleft(#1\mright)%
}
\makeatother
\begin{document}
\[ \E{X}, \E_x{X}, \E^2{X}, \E_x^2{X}, \E^2_x{X} \]
\end{document}
Best Answer
you can define a shortcut for this