文の分割と番号付け

Question

次のコードがあります:

\usepackage{amsmath, amsthm}
\begin{document}
        \begin{align}
       \begin{split}
    Case 1:\\
       \text{5 is a square modulo q and 29 is not a square modulo q from which we obtain} \label{529spilt}\\
    q \equiv \pm 1 \pmod{5} \,\, \text{and} \,\,  q \equiv 2,3,8,10,11,12,14,15,17,18,19,21,26,27 \pmod{29}\\
    Case 2:\\
    \text{5 is not a square modulo q and 29 is a square modulo q from which we obtain} \\
    q \equiv \pm 2 \pmod{5}  \,\, \text{and} \,\,  q \equiv 1,4,5,6,7,9,13,16,20,22,23,24,25,28 \pmod{29}
       \end{split}
    \end{align}
\end{document}

これらの文に番号を付けたいので align 環境を使用しましたが、かなり乱雑になってしまいました。(添付の画像を参照してください)。もっと良い書き方はありますか?

Answer 1

大量のテキストを方程式のようにラベル付けしたいかどうかはわかりませんが、別のバージョンを次に示します。

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\begin{equation} \label{529spilt}
\begin{minipage}{0.8\displaywidth}
Case 1: $5$ is a square modulo $q$ and $29$ is not a square modulo $q$
from which we obtain \\[.5\abovedisplayskip]
\hspace*{1.5em}$q \equiv \pm 1 \pmod{5}$ and \\
\hspace*{1.5em}$q \equiv 2,3,8,10,11,12,14,15,17,18,19,21,26,27 \pmod{29}$

\vspace{.5\belowdisplayskip}

Case 2: $5$ is not a square modulo $q$ and $29$ is a square modulo $q$
from which we obtain \\[.5\abovedisplayskip]
\hspace*{1.5em}$q \equiv \pm 2 \pmod{5}$ and \\
\hspace*{1.5em}$q \equiv 1,4,5,6,7,9,13,16,20,22,23,24,25,28 \pmod{29}$
\end{minipage}
\end{equation}

\end{document}

ここに別の認識があります:

\documentclass{article}

\usepackage{amsmath}
\usepackage{lipsum} % just for the example

\begin{document}

\lipsum[2]

\begin{subequations}\label{529spilt}
\begin{description}
\item[Case 1:] $5$ is a square modulo $q$ and $29$ is not a square modulo $q$
from which we obtain
\begin{align}
q &\equiv \pm 1 \pmod{5} \quad\text{and} \\
q &\equiv 2,3,8,10,11,12,14,15,17,18,19,21,26,27 \pmod{29}
\intertext{%
  \item[Case 2:] $5$ is not a square modulo $q$ and $29$ is a square modulo $q$
  from which we obtain
}
q &\equiv \pm 2 \pmod{5} \quad\text{and} \\
q &\equiv 1,4,5,6,7,9,13,16,20,22,23,24,25,28 \pmod{29}
\end{align}
\end{description}
\end{subequations}

\lipsum[3]

\end{document}

Answer 2

flalign以下は、amsmath の および\shortintertextに基づくソリューションですmathtools。

\documentclass{article}
\usepackage[showframe]{geometry}
\usepackage{mathtools}

\begin{document}

Text text text text text text text text text text text text text text text text text text text.
\begin{flalign}
  \shortintertext{\parbox{\linewidth}{\emph{Case 1:}
    \\ $ 5 $ is a square modulo $ q $ and $ 29 $ is not a square modulo $ q $ from which we obtain}}%
    \notag%
  & & & q \equiv \pm 1 \pmod{5}\enspace \text{and}\enspace q \equiv 2,3, 8,10, 11, 12, 14, 15, 17, 18, 19, 21, 26, 27 \pmod{29}& & \\[-0.3\baselineskip]
\label{foo} \\[-0.7\baselineskip]
  \shortintertext{\parbox{\linewidth}{\emph{Case 2:}\\
    $ 5 $ is not a square modulo $ q $ and $ 29 $ is a square modulo $ q $ from which we obtain}}%
    \notag%
  & & & q \equiv \pm 2 \pmod{5}\enspace \text{and}\enspace q \equiv 1, 4, 5, 6, 7, 9, 13, 16, 20, 22, 23, 24, 25, 28 \pmod{29}& &
\end{flalign}

\end{document}