amsmath
When I use the code below the subscript j appears to the side of the sum symbol, not underneath. Has anyone got any idea what I'm doing wrong?
\begin{equation}
\Delta{t}\leq\left[{C_i}\over{{\sum_{j}}{\frac{1}{R_{ij}}}}\right]_{min}
\label{eq:stability_criteria_3}
\end{equation}
A solution that uses alignat:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{alignat}{2}
&T &&= x + y \\
&T_{\text{total}} &&= y
\end{alignat}
\end{document}
the best approach in this particular case is to use align*, as that behaves well with \qedhere since each line is treated separately. (any of the multi-line options that treats lines separately should work equally well.)
\documentclass{scrartcl}
\usepackage[fleqn]{amsmath}
\usepackage{amsthm,amssymb}
\begin{document}
\begin{proof}
...
\begin{align*}
A&= B \\
&= C\\
&= D \qedhere
\end{align*}
\end{proof}
\end{document}
this isn't always ideal -- cases, for example, will always force the tombstone to the center vertically -- but the request has been made often enough to place the tombstone on the last line, that it should be considered as a possible option. i am adding it to the formal list of requests.
as noted elsewhere, with flush left equations and equation numbers on the right, there is a built-in conflict. that is why ams document classes default to using equation numbers on the left.
Best Answer
Consider using
\limitsas in the following:(Doesn't this make this ugly though?)