一般情况下，两个公式的关系比较多的是推导与被推导的关系，通常在被推导公式前放一箭头，但是前后公式表达关联关系就出现了困难，甚而有时我们也想在公式之间加入文本，而不想让文本占据单独行，也有类似的应用场景。
例如如下效果：
实现这一效果采用mathtools宏包即可。上图的代码实现如下：
[color=rgb(51, 51, 51) !important][backcolor=rgb(188, 188, 188) !important]
[backcolor=transparent !important]
[backcolor=transparent !important]
[backcolor=transparent !important]
[backcolor=transparent !important]
[backcolor=transparent !important]
[color=rgb(153, 153, 153) !important]TeX
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| [color=rgb(0, 111, 224) !important]
-
- \documentclass{article}
- \usepackage{mathtools}
- \newcommand\TextBetweenLines[1]{\ArrowBetweenLines[\text{#1}]}
-
- \begin{document}
-
- \begin{alignat*}{2}
- & & y_{0} & =\frac{\pm\sqrt{1-z^{2}}}{z} \\
- \ArrowBetweenLines & & y_{0}z & =\pm\sqrt{1-z^{2}} \\
- \ArrowBetweenLines & & y_{0}^{2}z^{2} & =1-z^{2}
- \end{alignat*}
-
- \begin{alignat*}{2}
- y_{0}^{2}z^{2} & =1-z^{2} & & \\
- \ArrowBetweenLines *(1+y_{0})z^{2} & =1 & & \\
- \ArrowBetweenLines* z & =\pm\frac{1}{1+y_{0}^{2}}. & &
- \end{alignat*}
-
- \begin{alignat*}{2}
- & & D_{1} & \coloneqq C_{a}\cap\left\{ (x,y,z)\in D_{2}:x>0\right\} \\
- \TextBetweenLines{and} & & D_{2} & :=\left\{ (x,y,z)\in D_{1}:x<0\right\} .
- \end{alignat*}
-
- \end{document}
|
选自：http://tex.stackexchange.com/questions/262604/typesetting-displayed-equivalences-and-definitions-of-unequal-length
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