删除两列方程式下方的垂直空格，并对同一列中的两个方程式进行单一编号

Question

我之前问过一个关于两列方程式之间的垂直间距的问题。这个问题已经得到解答，但是当我使用以下代码时，这些方程式和下面的文本之间出现了很大的垂直间距。

此外，目前，每个方程都有一个单独的编号。我希望这两个方程，即方程行只有一个数字。因此，理想情况下，整行都应编号（8）。

有人可以帮我吗？

\documentclass{article}
\begin{document}

\begin{multicols}{2}
\noindent
\begin{equation}
C_{O,t}(j) = (1-\alpha_c)\left(\frac{P_{O,t}}{P_{C,t}}\right)^{-\omega_c} C_{t}(j)
\end{equation}\columnbreak
\begin{equation}
C_{Z,t}(j) = \alpha_c\left(\frac{P_{Z,t}}{P_{C,t}}\right)^{-\omega_c} C_{t}(j).
\end{equation}
\end{multicols}
\noindent
Therefore, the consumption-based price index (CPI), $P_{C,t}$ is given by,
\end{document}

Answer 1

考虑到所需的输出，我认为使用multicols和两个equation环境并不是完成当前任务的正确工具。你可以只使用一 equationamsmath如果需要多行对齐，则添加一些水平间距或其他的环境：

\documentclass{article}
\usepackage{amsmath}

\begin{document}

$P_{O,t}$ are the core consumption deflator and the price of oil, respectively. This implies,
\begin{equation}
C_{O,t}(j) = (1-\alpha_c)\biggl(\frac{P_{O,t}}{P_{C,t}}\biggr)^{-\omega_c} C_{t}(j)\qquad
C_{Z,t}(j) = \alpha_c\biggl(\frac{P_{Z,t}}{P_{C,t}}\biggr)^{-\omega_c} C_{t}(j). 
\end{equation}
Therefore, the consumption-based price index (CPI), $P_{C,t}$ is given by,

$P_{O,t}$ are the core consumption deflator and the price of oil, respectively. This implies,
\begin{equation}
\begin{aligned}
C_{O,t}(j) &= (1-\alpha_c)\biggl(\frac{P_{O,t}}{P_{C,t}}\biggr)^{-\omega_c} C_{t}(j)\\
C_{Z,t}(j) &= \alpha_c\biggl(\frac{P_{Z,t}}{P_{C,t}}\biggr)^{-\omega_c} C_{t}(j). 
\end{aligned}
\end{equation}
Therefore, the consumption-based price index (CPI), $P_{C,t}$ is given by,

\end{document}

结果：

我还将\left，对更改\right为\bbigl，\bbigr以避免为前者添加不必要的水平间距。

Answer 2

您可以使用并排minipage环境，每个环境0.5\textwidth都很宽。在第一个环境中使用一个equation*环境，equation在第二个环境中使用一个环境。

\documentclass{article}
\usepackage{amsmath}
\usepackage[margin=1in]{geometry}
\begin{document}
\setcounter{equation}{7} % just for this example
\noindent 
Therefore, the consumption-based price index (CPI), $P_{C,t}$ is given by \dots
\par\noindent
\begin{minipage}{0.5\textwidth}
\begin{equation*}
C_{O,t}(j) = (1-\alpha_c)\left(\frac{P_{O,t}}{P_{C,t}}\right)^{-\omega_c} C_{t}(j)
\end{equation*}
\end{minipage}%
\begin{minipage}{0.5\textwidth}
\begin{equation}
C_{Z,t}(j) = \alpha_c\left(\frac{P_{Z,t}}{P_{C,t}}\right)^{-\omega_c} C_{t}(j).
\end{equation}
\end{minipage}
\par\noindent
Therefore, the consumption-based price index (CPI), $P_{C,t}$ is given by \dots

\end{document}

Answer 3

这里不需要使用“双列布局”。相反，可以使用单列布局，equation中间留有固定的空格（例如\qquad），或者使用以下布局之一amsmath类似align的环境来均匀分布方程：

\documentclass{article}
\usepackage[margin=1in,showframe]{geometry}% Just for this example
\usepackage{amsmath,mleftright}
\begin{document}

$P_{O,t}$ are the core consumption deflator and the price of oil, respectively. This implies
\begin{equation}
  C_{O,t}(j) = (1-\alpha_c)\mleft(\frac{P_{O,t}}{P_{C,t}}\mright)^{-\omega_c} C_{t}(j)
  \qquad
  C_{Z,t}(j) = \alpha_c\mleft(\frac{P_{Z,t}}{P_{C,t}}\mright)^{-\omega_c} C_{t}(j).
\end{equation}
Therefore, the consumption-based price index (CPI),~$P_{C,t}$ is given by, \ldots

\noindent\hrulefill

$P_{O,t}$ are the core consumption deflator and the price of oil, respectively. This implies
\begin{align}
  C_{O,t}(j) = (1-\alpha_c)\mleft(\frac{P_{O,t}}{P_{C,t}}\mright)^{-\omega_c} C_{t}(j)
  &&
  C_{Z,t}(j) = \alpha_c\mleft(\frac{P_{Z,t}}{P_{C,t}}\mright)^{-\omega_c} C_{t}(j).
\end{align}
Therefore, the consumption-based price index (CPI),~$P_{C,t}$ is given by, \ldots

\end{document}