☰

将等式的第二行置于中心

tag-icon • tag-icon equations amsmath align
将等式的第二行置于中心

我如何获得以下输出？

f a b c =
    <centered definition of f>
g a b c d =
    <centered definition of g>

这些是函数的定义，但是函数体很大；我想将函数和参数移到左边，但将函数体置于中央。

困难在于（函数和参数）+（函数定义）的长度大于列的长度。我无法找到使用 、 、 和 中的任何一个来做到这multline一点align的alignat方法flalign。

答案1

滥用flalign ;-)在我看来，将第一部分刷新到边缘似乎不太好，因此我提供了两个宏来将其向前推；使用 ，\rhide您可以将其对齐到右端，反之亦然\lhide。

\documentclass{article}
\usepackage{showframe}
\usepackage{mathtools}

\newcommand{\rhide}[2]{\mathrlap{\hspace{#1}\mathllap{#2}}}
\newcommand{\lhide}[2]{\mathrlap{\hspace{#1}#2}}

\begin{document}


\begin{flalign*}
\mathrlap{f a b c ={}}\\
&&    <very very very very  long centered definition of f>&&\\
\mathrlap{g a b c d ={}}\\
&&    <very very very very  long centered definition of g>&&
\end{flalign*}

\begin{flalign*}
\rhide{8em}{f a b c ={}}\\
&&    <very very very very  long centered definition of f>&&\\
\rhide{8em}{g a b c d ={}}\\
&&    <very very very very  long centered definition of g>&&
\end{flalign*}

\begin{flalign*}
\lhide{4em}{f a b c ={}}\\
&&    <very very very very  long centered definition of f>&&\\
\lhide{4em}{g a b c d ={}}\\
&&    <very very very very  long centered definition of g>&&
\end{flalign*}

\end{document}

在此处输入图片描述

答案2

如果也允许使用棘手的解决方案...我们使用的事实是，将gather线条居中。棘手的是\intertext。

\documentclass{article}

\usepackage{amsmath}

\begin{document}


\begin{gather*}
\intertext{$f a b c ={}$}
    <very very very very  long centered definition of f>\\
\intertext{$g a b c d ={}$}\\
    <very very very very  long centered definition of g>
\end{gather*}


\begin{gather*}
\intertext{\hfill$f a b c ={}$}
    <very very very very  long centered definition of f>\\
\intertext{\hfill$g a b c d ={}$}\\
    <very very very very  long centered definition of g>
\end{gather*}

\end{document}

在此处输入图片描述

答案3

您是否尝试过将正文的字体大小调小？我想这样可以更轻松地有效使用其中一个环境。或者尝试使用环境tabular？

相关内容