alignamsmathequationspositioning
The align command from amsmath allows me to put two equations side-by-side:
\begin{align}
x = y && a = b
\end{align}
Unfortunately for my purposes, this shows both equations under one equation number:
x = y a = b (1)
Is there any way to give them individual numbers, so that the output looks like this?:
x = y (1) a = b (2)
Here is another approach, with some braces added to "combine" the separate equation sets. Of course, these can be removed if needed. Each equation set is aligned along the binary relations in an rcl (right-center-left) fashion with the appropriate spacing.
\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\begin{document}
\begin{align*}
\left.\begin{array}{r@{\mskip\thickmuskip}l}
\nabla f(x) -\mu X^{-1} e + A(x) \lambda - z &= 0, \\
c(x) &= 0, \\
-\mu X^{-1} e + z &= 0, \\
x &> 0 \\
z &> 0
\end{array} \right\}
\quad \implies \quad
\left\{\begin{array}{r@{\mskip\thickmuskip}l}
\nabla f(x) + A(x) \lambda - 2z &= 0, \\
c(x) &= 0, \\
-\mu X^{-1} e + z &= 0, \\
x &> 0 \\
z &> 0
\end{array}\right.
\end{align*}
\end{document}
Pass the option leqno to your document class, to be used by the class and also inherited by packages, such as the amsmath package. It would already work if you would specify the option directly to amsmath, however for consistency I would already use it at class level.
\documentclass[leqno]{article}
\usepackage{amsmath}
\begin{document}
\begin{multline}
some equation
\end{multline}
\end{document}
leqno means left equation numbers.
Best Answer