如何在聚集方程环境中左对齐文本

如何在聚集方程环境中左对齐文本

我目前正在尝试将方程式添加到我的论文中,由于方程式很长,我想使用简写将方程式拆分。我想要实现的是方程式有两个换行符,后面跟着一个左对齐的 where,其他方程式位于一个聚集环境中,方程式编号与顶行对齐。我已经实现了大部分功能,但在聚集环境中我无法让“where”行左对齐,我试过了,\intertext使用聚集时似乎不起作用。有什么建议吗?

\begin{equation}\label{eq:triclinic(hkl)}
        \begin{gathered}[t]
        \frac{1}{d^2} = \frac{1}{V^2} (S_{11}h^2 + S_{22} k^2 + S_{33} \ell^2 + 2S_{12}hk + 2S_{23}k\ell + 2S_{13}h\ell)\\~\\
        \text{where}\\~\\
        V      = abc \sqrt{1 - cos^2(\alpha) - cos^2(\beta) - cost^2(\gamma) + 2cos(\alpha) cos(\beta) cos(\gamma)}\\
        S_{11} = b^2c^2sin^2(\alpha)\\
        S_{22} = a^2c^2sin^2(\beta)\\
        S_{33} = a^2 b^2 sin^2 (\gamma)\\
        S_{12} = abc^2 (cos(\alpha) cos(\beta) - cos(\gamma))\\
        S_{23} = a^2bc (cos(\beta) cos(\gamma) - cos(\alpha)\\
        S_{13} = ab^2c (cos(\gamma) cos(\alpha) - cos(\beta)\\
        \end{gathered}
    \end{equation}

答案1

您可以在中设置此项align,并使用它\notag来删除不需要编号的方程式的任何方程式编号:

在此处输入图片描述

\documentclass{article}

\usepackage{mathtools}

\begin{document}

Original equation
\begin{equation}
  \begin{gathered}[t]
    \frac{1}{d^2} = \frac{1}{V^2} (S_{11}h^2 + S_{22} k^2 + S_{33} \ell^2 + 2S_{12}hk + 2S_{23}k\ell + 2S_{13}h\ell)\\~\\
    \text{where}\\~\\
    V      = abc \sqrt{1 - cos^2(\alpha) - cos^2(\beta) - cost^2(\gamma) + 2cos(\alpha) cos(\beta) cos(\gamma)}\\
    S_{11} = b^2c^2sin^2(\alpha)\\
    S_{22} = a^2c^2sin^2(\beta)\\
    S_{33} = a^2 b^2 sin^2 (\gamma)\\
    S_{12} = abc^2 (cos(\alpha) cos(\beta) - cos(\gamma))\\
    S_{23} = a^2bc (cos(\beta) cos(\gamma) - cos(\alpha)\\
    S_{13} = ab^2c (cos(\gamma) cos(\alpha) - cos(\beta)\\
  \end{gathered}
\end{equation}

Proposed improvement
\begin{align}
    \frac{1}{d^2} &= \frac{1}{V^2} \bigl( S_{11}h^2 + S_{22} k^2 + S_{33} \ell^2 + 2S_{12}hk + 2S_{23}k\ell + 2S_{13}h\ell \bigr) \\
\shortintertext{where}
         V &= a b c \sqrt{1 - \cos^2(\alpha) - \cos^2(\beta) - \cos^2(\gamma) + 2 \cos(\alpha) \cos(\beta) \cos(\gamma)} \notag \\
    S_{11} &= b^2 c^2 \sin^2(\alpha) \notag \\
    S_{22} &= a^2 c^2 \sin^2(\beta) \notag \\
    S_{33} &= a^2 b^2 \sin^2 (\gamma) \notag \\
    S_{12} &= a b c^2 \bigl( \cos(\alpha) \cos(\beta) - \cos(\gamma) \bigr) \notag \\
    S_{23} &= a^2 b c \bigl( \cos(\beta) \cos(\gamma) - \cos(\alpha) \bigr) \notag \\
    S_{13} &= a b^2 c \bigl( \cos(\gamma) \cos(\alpha) - \cos(\beta) \bigr) \notag
\end{align}

\end{document}

答案2

我建议这样的布局:

\documentclass{article}

\usepackage{mathtools}

\begin{document}

\begin{align}
    \frac{1}{d^2} &= \frac{1}{V^2} \bigl( S_{11}h^2 + S_{22} k^2 + S_{33} \ell^2 + 2S_{12}hk + 2S_{23}k\ell + 2S_{13}h\ell \bigr) \\
\intertext{where \quad$ \begin{array}[t]{|l@{}}
         V = a b c \sqrt{1 - \cos^2\alpha - \cos^2\beta - \cos^2\gamma + 2 \cos\alpha \cos\beta \cos\gamma} \\[1ex] \begin{aligned}[t]
    S_{11} &= b^2 c^2 \sin^2\alpha \qquad &
    S_{12} &= a b c^2 \bigl( \cos\alpha \cos\beta - \cos\gamma \bigr) \\
    S_{22} &= a^2 c^2 \sin^2\beta & S_{23} &= a^2 b c \bigl( \cos\beta \cos\gamma - \cos\alpha \bigr)\\
    S_{33} &= a^2 b^2 \sin^2 \gamma & S_{13} &= a b^2 c \bigl( \cos\gamma \cos\alpha - \cos\beta \bigr)
\end{aligned}
\end{array}$} \notag
\end{align}

\end{document} 

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答案3

没有必要将所有内容都放在一个显示器上:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{equation}\label{eq:triclinic(hkl)}
\frac{1}{d^2} = \frac{1}{V^2} (
  S_{11}h^2 + S_{22} k^2 + S_{33} \ell^2 +
  2S_{12}hk + 2S_{23}k\ell + 2S_{13}h\ell
)
\end{equation}
where
\begin{align*}
V      &= abc \sqrt{
  1 - \cos^2(\alpha) - \cos^2(\beta) - \cos^2(\gamma) +
  2\cos(\alpha) \cos(\beta) \cos(\gamma)
}\\
S_{11} &= b^2c^2\sin^2(\alpha)\\
S_{22} &= a^2c^2\sin^2(\beta)\\
S_{33} &= a^2b^2\sin^2(\gamma)\\
S_{12} &= abc^2 (\cos(\alpha) \cos(\beta) - \cos(\gamma))\\
S_{23} &= a^2bc (\cos(\beta) \cos(\gamma) - \cos(\alpha)\\
S_{13} &= ab^2c (\cos(\gamma) \cos(\alpha) - \cos(\beta)
\end{align*}

\end{document}

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如果愿意,您可以gather*在底部显示中使用(没有尾随,请注意)。\\

使用\cos\sin作为三角函数。

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