equations
What is the best way to achieve a list where items are seamlessly aligned either left, centered, or right. I am more so interested in the items being left aligned, (for instance a series or (system) of equations). I have an equation "E" and want to create a left aligned list describing what the variables represent or equal to as shown in the example below.
You can use m-type columns and flalign for left aligning the numbered equation. Some vertical space corrections are needed, but they're hidden in a macro, so you don't need to specify them each time.
\documentclass{report}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage[intlimits]{amsmath}
\usepackage{booktabs,array}
\usepackage{caption}
\newcommand{\tableequation}[1]{%
\vspace*{-\baselineskip}
{\begin{flalign}#1&&&\end{flalign}}%
\vspace*{-\baselineskip}
}
\begin{document}
With a reference to one of the equations, \eqref{eq-sV}
\begin{table}[htb]
\centering
\caption{testststt} \label{tab_BG1_zustand}
\begin{tabular}{
@{}
>{\linespread{1.2}\selectfont}m{6cm}
@{}
m{6cm}
@{}
}
\toprule
Zustandsgröße & Beziehung \\
\midrule
spezifisches Volumen\newline
$v = (\partial g / \partial p)_T$ &
\tableequation{
v(\pi,\tau)\frac{p}{R T} = \pi \gamma_{\pi} \label{eq-sV}
} \\
spezifische innere Energie\newline
$u=g-T(\partial g / \partial T)_p - p(\partial g / \partial p)_T$ &
\tableequation{
\frac{u(\pi,\tau )}{R T} = \tau \gamma_{\tau}
} \\
\bottomrule
\end{tabular}
\end{table}
\end{document}
Another solution (and numbering) with the empheq package (which loads mathtools, which loads amsmath):
\documentclass{article}
\usepackage[a4paper,margin=2.5cm]{geometry} % set page parameters
\usepackage{amsfonts, % for \mathbb and \mathcal macros
empheq}%
\numberwithin{equation}{subsection}
\setcounter{section}{1}
\setcounter{subsection}{1}
\begin{document}
\begin{subequations}
\begin{empheq}[left={\mathbb{E}(X)=\displaystyle\int_{-\infty}^{\infty} x\,dF(x)=\empheqlbrace}]{alignat = 2}
& \sum_{x \in \mathcal{X}} xf_{X}(x) =\sum_{x \in \mathcal{X}} x\mathbb{P}(X=x)
&\qquad & \text{if $X$ is discrete}, \\
& \int_{-\infty}^{\infty} xf_{X}(x)\,dx
& &\text{if $X$ is continuous}. \end{empheq}
\end{subequations}
\begin{subequations}
\begin{empheq}[left={\mathbb{E}(X)=\displaystyle∫_{-∞}^{∞} x\,dF(x)=\empheqlbrace}]{flalign}
& ∑_{x ∈ \mathcal{X}} xf_{X}(x) =∑_{x ∈ \mathcal{X}} x\mathbb{P}(X=x)
& &\text{if $X$ is discrete},&\hspace{5em} & \\
& ∫_{-∞}^{∞} xf_{X}(x)\,dx
&& \text{if $X$ is continuous}. \end{empheq}
\end{subequations}
\end{document}
Best Answer
I would do this using an itemized list:
If you want the terms left aligned instead, you can use the
[align=left, leftmargin=<length>, labelwidth=\widthof{<widest_term>}]options to produce:Note:
geometrypackage and the adjusted thepaperwidth=so that the wrapping of the lines can more easily be seen.Code: