公式部分有不必要的编号

公式部分有不必要的编号

我正在写下面的方程,但我遇到一个问题,即同一方程的不同步骤的方程编号正在出现。

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MWE 如下,

\documentclass{article}
\usepackage{mathtools, nccmath}
\usepackage{array}
\begin{document}
\begin{fleqn}
    \begin{align}
        & L_{B_{1} A_{1}} L_{B_{0} A_{0}}\left(\left|I_{1}\right\rangle\right) =L_{B_{1} A_{1}} L_{B_{0} A_{0}}\left(\frac{1}{2^{m}} \sum_{b=0}^{2^{m}-1} \sum_{a=0}^{2^{m}-1}\left|P_{b a}\right\rangle\left|b^{\prime}\right\rangle\left|a^{\prime}\right\rangle\right)\\
        & =\frac{1}{2^{m}}\Biggl(\underset{b a \neq B_{0} A_{0}, B_{1} A_{1}}{\displaystyle\sum_{b=0}^{2^{m}-1} \sum_{a=0}^{2^{m}-1}}\left|P_{ba}\right\rangle\left|b^{\prime}\right\rangle\left|a^{\prime}\right\rangle \begin{aligned}[t] & +U_{B A}\left(\left|P_{B_{0} A_{0}}\right|\right)\left|B_{0} A_{0}\right\rangle\\
            & +U_{B A}\left(\left|P_{B_{1} A_{1}}\right\rangle\right)\left|B_{1} A_{1}\right\rangle\Biggr)
        \end{aligned}\\
        & =\frac{1}{2^{m}}
        \Biggl( \underset{b a \neq B_{0} A_{0}, B_{1} A_{1}}{\sum_{b=0}^{2^{m}-1} \sum_{a=0}^{2^{m}-1}}\hspace*{-0.5em}\left|P_{b a}\right\rangle\left|b^{\prime}\right\rangle\left|a^{\prime}\right\rangle
        \begin{aligned}[t] &+\left|p_{B_{0} A_{0}}^{2} p_{B_{0} A_{0}}^{3^{\prime}} \cdots p_{B_{0} A_{0}}^{0^{\prime}} p_{B_{0} A_{0}}^{1^{\prime}}\right\rangle\left|B_{0} A_{0}\right\rangle \\
            &+\left|p_{B_{1} A_{1}}^{2^{\prime}} p_{B_{1} A_{1}}^{3^{\prime}} \cdots p_{B_{1} A_{1}}^{0^{\prime}} p_{B_{1} A_{1}}^{1^{\prime}}\right\rangle\left|B_{1} A_{1}\right\rangle\Biggr)
        \end{aligned}
        \label{lb1a1}
    \end{align}
\end{fleqn}
\end{document}

请有人帮我删除步骤中不必要的编号 (1) 和 (2)。

答案1

由于您希望获得单个方程编号,我建议您align用一对嵌套的equationaligned环境替换环境。我还希望\ket尽快采用 -type 符号。

在此处输入图片描述

\documentclass{article}
\usepackage{mathtools} % for '\DeclarePairedDelimiter' macro
\DeclarePairedDelimiter\abs\lvert\rvert
\DeclarePairedDelimiter\ket\lvert\rangle

\begin{document}
\begin{equation}\label{lb1a1}
\begin{aligned}[b]
& L_{B_1 A_1} L_{B_0 A_0} (\ket{1}) 
  =L_{B_1 A_1} L_{B_0 A_0} 
  \biggl( \frac{1}{2^m} 
     \sum_{b=0}^{2^m\mkern-2mu-1} 
     \sum_{a=0}^{2^m\mkern-2mu-1} 
     \ket{P_{b a}} \ket{b'} \ket{a'} \biggr)\\
&=
  \begin{multlined}[t]
  \frac{1}{2^m} \biggl(\,
  \smash[b]{\underset{\mathclap{ba\neq B_0A_0, B_1A_1}}{
     \sum_{b=0}^{2^m\mkern-2mu-1} 
     \sum_{a=0}^{2^m\mkern-2mu-1}}}
     \ket{P_{ba}} \ket{b'} \ket{a'} 
        +U_{B A}(\abs{P_{B_0 A_0}})\ket{B_0 A_0}\\
        +U_{B A}(\ket{P_{B_1 A_1}})\ket{B_1 A_1} \smash{\biggr)}
  \end{multlined}\\
&=
  \begin{multlined}[t]
  \frac{1}{2^m} \biggl( \,
  \smash[b]{\underset{\mathclap{ba\neq B_0A_0, B_1A_1}}{
      \sum_{b=0}^{2^m\mkern-2mu-1} 
      \sum_{a=0}^{2^m\mkern-2mu-1}}}
      \ket{P_{b a}} \ket{b'} \ket{a'}
      +\ket[\big]{p_{B_0 A_0}^{2} p_{B_0 A_0}^{3'} \dots p_{B_0 A_0}^{0'} p_{B_0 A_0}^{1'}}  
       \ket[\big]{B_0 A_0} \\
      +\ket[\big]{p_{B_1 A_1}^{2'} p_{B_1 A_1}^{3'} \dots p_{B_1 A_1}^{0'} p_{B_1 A_1}^{1'}} 
       \ket[\big]{B_1 A_1} \smash[t]{\biggr)}
    \end{multlined}
\end{aligned}
\end{equation}
\end{document}

答案2

艰难的调整。

我会让第一行的宽度为零,这样我们就可以利用下一行的对称性并在符号=+符号处对齐。

\documentclass{article}
\usepackage[tbtags]{mathtools}

\DeclarePairedDelimiter{\KET}{\lvert}{\rangle}
\NewDocumentCommand{\ket}{som}{%
  \mathinner{%
    \IfBooleanTF{#1}
      {\KET*{#3}}
      {\IfNoValueTF{#2}{\KET{#3}}{\KET[#2]{#3}}}%
  }%
}

\begin{document}

\begin{alignat}{2}
& \lefteqn{
    L_{B_{1} A_{1}} L_{B_{0} A_{0}}(\ket{I_{1}})
    =L_{B_{1} A_{1}} L_{B_{0} A_{0}}\biggl(
      \frac{1}{2^{m}}
      \sum_{b=0}^{2^{m}-1}
      \sum_{a=0}^{2^{m}-1}\ket{P_{b a}}\ket{b'}\ket{a'}
    \biggr)
   }
\notag
\\
&= \frac{1}{2^{m}}\biggl(
     \smash[b]{
       \underset{b a \neq B_{0} A_{0}, B_{1} A_{1}}{
         \displaystyle\sum_{b=0}^{2^{m}-1} \sum_{a=0}^{2^{m}-1}
       }
     }
     \hspace{-0.5em}
     \ket{P_{ba}}\ket{b'}\ket{a'}
     &&+ U_{B A}(\ket{P_{B_{0} A_{0}}})\ket{B_{0} A_{0}}
\notag
\\
&    &&+ U_{B A}(\ket{P_{B_{1} A_{1}}})\ket{B_{1} A_{1}}
   \biggr)
\notag
\\
&= \frac{1}{2^{m}}
   \biggl(
     \smash[b]{
       \underset{b a \neq B_{0} A_{0}, B_{1} A_{1}}{
         \displaystyle\sum_{b=0}^{2^{m}-1} \sum_{a=0}^{2^{m}-1}
       }
     }
     \hspace{-0.5em}
     \ket{P_{b a}}\ket{b'}\ket{a'}
     &&+ \ket[\big]{
           p_{B_{0} A_{0}}^{2} p_{B_{0} A_{0}}^{3'}
           \cdots
           p_{B_{0} A_{0}}^{0'} p_{B_{0} A_{0}}^{1'}
         }
         \ket{B_{0} A_{0}}
\notag
\\
&    && +\ket[\big]{
           p_{B_{1} A_{1}}^{2'} p_{B_{1} A_{1}}^{3'}
           \cdots p_{B_{1} A_{1}}^{0'}
           p_{B_{1} A_{1}}^{1'}
         }
         \ket{B_{1} A_{1}}
   \biggr)
\label{lb1a1}
\end{alignat}

\end{document}

我定义了一个\ket命令来避免\left和的笨拙组合\right。使用\mathinner可确保两个 kets 之间有一点水平间距。

在此处输入图片描述

答案3

\nonumber在行尾插入,希望 LaTeX 在编号时跳过这些行。因此,您可以通过放置\nonumber在第一行和第二行上来仅选择第三行进行编号。

\documentclass{article}
\usepackage{mathtools, nccmath}
\usepackage{array}
\begin{document}
    \begin{fleqn}
        \begin{align}
            & L_{B_{1} A_{1}} L_{B_{0} A_{0}}\left(\left|I_{1}\right\rangle\right) =L_{B_{1} A_{1}} L_{B_{0} A_{0}}\left(\frac{1}{2^{m}} \sum_{b=0}^{2^{m}-1} \sum_{a=0}^{2^{m}-1}\left|P_{b a}\right\rangle\left|b^{\prime}\right\rangle\left|a^{\prime}\right\rangle\right) \nonumber\\
            & =\frac{1}{2^{m}}\Biggl(\underset{b a \neq B_{0} A_{0}, B_{1} A_{1}}{\displaystyle\sum_{b=0}^{2^{m}-1} \sum_{a=0}^{2^{m}-1}}\left|P_{ba}\right\rangle\left|b^{\prime}\right\rangle\left|a^{\prime}\right\rangle \begin{aligned}[t] & +U_{B A}\left(\left|P_{B_{0} A_{0}}\right|\right)\left|B_{0} A_{0}\right\rangle\\
                & +U_{B A}\left(\left|P_{B_{1} A_{1}}\right\rangle\right)\left|B_{1} A_{1}\right\rangle\Biggr)
            \end{aligned} \nonumber \\
            & =\frac{1}{2^{m}}
            \Biggl( \underset{b a \neq B_{0} A_{0}, B_{1} A_{1}}{\sum_{b=0}^{2^{m}-1} \sum_{a=0}^{2^{m}-1}}\hspace*{-0.5em}\left|P_{b a}\right\rangle\left|b^{\prime}\right\rangle\left|a^{\prime}\right\rangle
            \begin{aligned}[t] &+\left|p_{B_{0} A_{0}}^{2} p_{B_{0} A_{0}}^{3^{\prime}} \cdots p_{B_{0} A_{0}}^{0^{\prime}} p_{B_{0} A_{0}}^{1^{\prime}}\right\rangle\left|B_{0} A_{0}\right\rangle \\
                &+\left|p_{B_{1} A_{1}}^{2^{\prime}} p_{B_{1} A_{1}}^{3^{\prime}} \cdots p_{B_{1} A_{1}}^{0^{\prime}} p_{B_{1} A_{1}}^{1^{\prime}}\right\rangle\left|B_{1} A_{1}\right\rangle\Biggr)
            \end{aligned}
            \label{lb1a1}
        \end{align}
    \end{fleqn}
\end{document}

文章中的方程式块,但第一行和第二行没有编号,第三行有 (1)

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