equationsmath-modetext manipulation
I have, as part of an equation, the object
a^{5} \left(\frac{b}{c}\right)^{\frac{2}{3}}
The problem is that the 2 and 3 are very small (compared to the 5) and I would like all sub/superscripts to be the same size just as all body text is the same size. Is there a way of defining the font size inside the equation environment?
To get equal sizes, you could use \DeclareMathSizes in your preamble. The syntax is
\DeclareMathSizes{display size}{text size}{script size}{scriptscript size}.
You could simply set all to your default font size. In this example:
\documentclass[10pt]{article}
\begin{document}
\[
x = \frac{1}{x + \frac{1}{x + \frac{1}{x}}}
\]
\end{document}
where you firstly get different sizes:
inserting this line
\DeclareMathSizes{10}{10}{10}{10}
changes the output to:
The Problem lies within the definition of \textsuperscript that uses math mode.
\DeclareRobustCommand*\textsuperscript[1]{%
\@textsuperscript{\selectfont#1}}
\def\@textsuperscript#1{%
{\m@th\ensuremath{^{\mbox{\fontsize\sf@size\z@#1}}}}}
A possible workaround is redefining the actual command so that it will not get in the way with your equations, this needs graphicx:
\renewcommand{\textsuperscript}[1]{\raisebox{0.8ex}{\scalebox{0.66}{#1}}}
Or this needs relsize
\renewcommand{\textsuperscript}[1]{\raisebox{0.8ex}{\smaller{#1}}}
I admit that this is just an easy workaround emulating the typrsetting of superscripts. It might be possible, that modern typography defines super/subscript in a certain way.
This also works with various enlargements of text sizes. This MWE also emulates a textsubscript:
\documentclass[12pt,oneside,letterpaper,titlepage]{article}
\DeclareMathSizes{12}{20}{14}{10}
%% Solution 1
\usepackage{relsize} %smaller
\renewcommand{\textsuperscript}[1]{\raisebox{0.8ex}{\smaller{#1}}}
\newcommand{\textsubscript}[1]{\raisebox{-0.4ex}{\smaller{#1}}}
%% Solution 2
%%\usepackage{graphicx} %scalebox
%%\renewcommand{\textsuperscript}[1]{\raisebox{0.8ex}{\scalebox{0.66}{#1}}}
%%\newcommand{\textsubscript}[1]{\raisebox{-0.4ex}{\scalebox{0.66}{#1}}}
\begin{document}
...modulation by Ca\textsuperscript{2+}...
...soluted in water H\textsubscript{2}O...\\
\tiny Ca\textsuperscript{2+}
\scriptsize Ca\textsuperscript{2+}
\footnotesize Ca\textsuperscript{2+}
\small Ca\textsuperscript{2+}
\normalsize Ca\textsuperscript{2+}
\large Ca\textsuperscript{2+}
\Large Ca\textsuperscript{2+}
\LARGE Ca\textsuperscript{2+}
\huge Ca\textsuperscript{2+}
\Huge Ca\textsuperscript{2+}
\normalsize
\begin{equation}
\sigma^2 = iI - \frac{I^2}{N}
\end{equation}
\end{document}
Further reading relsize and graphicx.
For chemistry typesetting (I guessed that on the calcium bit) there are some packages available, like bpchem or mhchem, that handle formulas quite well.
Best Answer
Try
dfracinstead offrac:You will need the
amsmathpackage