subscripts
I have a problem with the subscript under a sum with dot, it changes the position of the subscript. Namely,
\documentclass[a4paper,12pt]{article}
\usepackage[english]{babel}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}
\begin{align}
\dot{\sum}_{i \in I}
\end{align}
\end{document}
places the subscript next to the sum instead of under it. Does anyone know how to fix this?
If you change from \dot{f_{\dot{x}}} to \dot{f}_{\dot{x}}, both dots will be placed correctly.
\documentclass{article}
\begin{document}
$f_{x}=\dot{f}_{\dot{x}}$
\end{document}
Addendum: A second MWE, which shows the OP's formula, the improvement suggested above, and a possible further improvement on.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{tabular}{ccc}
bad & good & best(?) \\[1ex]
$\dot{f_{\dot{x}}}$ & $\dot{f}_{\dot{x}}$ & $\dot{f}^{}_{\!\dot{x}}$
\end{tabular}
\end{document}
The _{t=0}^{t=T} in your line makes these things the superscript and subscript of the \lim\limits_{\Delta\rightarrow0}{}. I would do it using \prescript from mathtools package.
\usepackage{mathtools}
and then in the math environment:
\lim\limits_{\Delta\rightarrow0}{} \Delta\prescript{t=T}{t=0}{\left\vert\dfrac{df(t)}{dt}\right\vert^2 dt}
This provides the result as follows:
Best Answer
Using an accent upon
\summakes it lose the nature of operator. You simply have to reinstate it:The
\sumnext to\dotsumis just for checking the alignment.