我怎样才能编写一个\tag数学显示模式，使其不会自动被括号括起来，并且 Overleaf 不会抱怨？（我认为忽略 Overleaf 的抱怨是不好的做法。）
\documentclass{article}
\usepackage{amsmath, amssymb}
\begin{document}
The following would be perfect if the automatic parentheses enclosing the tag were removed:
\[J(2^m + l) = 2l + 1 \tag{for $m \geqq 0$ and $0 \leqq l < 2^m$}\]
The following output is good
\[J(2^m + l) = 2l + 1 \tag*{for $m \geqq 0$ and $0 \leqq l < 2^m$}\]
yet Overleaf complains about it; in particular, it introduces a red warning dot in the margin of the Code Editor, whose drop-down text reads:
\begin{verbatim}
unclosed open display math \[ found at $
unclosed open group { found at $
unexpected $ after open group {
unexpected $ after open display math \[
unexpected $ after open display math \[
unexpected $ after open display math \[
unexpected $ after open display math \[
\end{verbatim}
\end{document}
答案1
Overleaf 拒绝完全合法的 LaTeX 构造，这可不是件好事。另一方面，您不应该在这种情况下滥用标签，因为条件是方程式的一部分，而标签不是。
无论如何，你可以让 Overleaf 保持安静，使用\ttag由
\newcommand{\ttag}{\tag*}
避免在显示前留空行，这是错误的。如果下一个文本开始一个新段落，则可以在显示后留空行。
\documentclass{article}
\usepackage{amsmath, amssymb}
\newcommand{\ttag}{\tag*}
\begin{document}
The following would be perfect if the automatic parentheses enclosing the tag were removed:
\[
J(2^m + l) = 2l + 1
\tag{for $m \geqq 0$ and $0 \leqq l < 2^m$}
\]
The following output is good
\[
J(2^m + l) = 2l + 1
\ttag{for $m \geqq 0$ and $0 \leqq l < 2^m$}
\]
But this output is much better
\[
J(2^m + l) = 2l + 1,
\qquad\text{for $m \geqq 0$ and $0 \leqq l < 2^m$}
\]
as you can clearly see, because the conditions are part of the equation.
\end{document}
Overleaf 窗口没有显示红点。
