答案1
这看起来像一个multline
环境,其中第一个/最后一个方程式向左/向右偏移,而中间的方程式居中:
\documentclass{article}
\usepackage{amsmath,bm,lipsum}
\begin{document}
\lipsum*[1]
\begin{multline}
p(\tau, j \,\vert\, \bm{x},t)\, \mathrm{d}\tau
\equiv \text{the probability, given $\bm{X}(t) = \bm{x}$, that the \textit{next}} \\
\text{reaction in the system will occur in the infinitesimal time} \\
\text{interal $[t + \tau, t + \tau + \mathrm{d}\tau)$, \textit{and} will be an $R_j$ reaction.}
\label{eq:this_thing}
\end{multline}
\lipsum[2]
\end{document}
您可以使用\eqref{eq:this_thing}
它来引用文档中的公式。
答案2
一份提案
\documentclass{article}
\usepackage{mathtools}
\usepackage{xcolor}
\begin{document}
\setcounter{equation}{5}
\begin{align}
\MoveEqLeft[5] \fcolorbox{white}{yellow}{\phantom{X}}~~p(\tau,j|\mathbf{x},t)\equiv\text{the probability, given
$\boldsymbol{X}(t)=\textbf{x}$, that the \emph{next}} \notag\\
& \text{reaction in the system will occur in the infinitesimal}\notag\\
&\quad \text{interval $[t+\tau,t+\tau+\mathrm{d}\tau)$, and will be an $R_j$
reaction}\;.\label{eq:Defp}
\end{align}
\end{document}
答案3
如果您想要这样的格式(我不喜欢它),至少将文本变成一个常规段落,因为那些不平等的线条非常分散注意力。
\documentclass{article}
\usepackage{amsmath}
\usepackage{lipsum} % for dummy text
\newenvironment{eqdef}[1][0.8]
{\begin{equation}\begin{minipage}[b]{#1\columnwidth}}
{\end{minipage}\end{equation}}
\begin{document}
See~\eqref{foo} for the definition.
\lipsum*[3]
\begin{eqdef}\label{foo}
$p(\tau, j \mid \mathbf{x},t)\,d\tau\equiv{}$the probability,
given $\mathbf{X}(t) = \mathbf{x}$, that the \emph{next}
reaction in the system will occur in the infinitesimal time
interval $[t + \tau, t + \tau + d\tau)$, \emph{and} will be
an $R_j$ reaction.
\end{eqdef}
\lipsum[4]
\end{document}
使用可选参数,您可以修改内部小页面的大小。