我在分页符定位方面遇到了一些问题align。
我的代码大致如下。
\documentclass{article}
\usepackage{amsmath, amsthm}
\begin{document}
%Lots of text to force the page break.
Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text.
\begin{proof}
%Some more text to force the page break and get the "$a=b$." in the correct position.
Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some $a=b$.
\begin{align*}
%Something pretty long to force a new page whilst leaving a blank area.
a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b
\end{align*}
\end{proof}
\end{document}
现在，align 会占用一个新页面，并在前一页的底部留下一大块空白，这很好。但是，它也会占用最后一行文本，最后一行文本只是$a=b$.这太愚蠢了！所以我想利用这个大空白空间，把 放在$a=b$.那里。有没有恰当的这样做的方式？（我在\newpage之前加上 得到了一个“黑客”答案\align，但这是不道德的！）
我相信标准答案是使用\minipage。但是，\proof对此的反应很奇怪。
笔记： 我发现这个问题，这个， 和这个。所有问题的答案都接近但未必准确（最后一个问题看起来很有希望，但与 minipage 存在同样的问题）。
答案1
这是由\predisplaypenalty哪个 latex 设置为最大值来控制的10000。减少这个以9900允许在此处分页：
\documentclass{article}
\usepackage{amsmath, amsthm}
\begin{document}
%Lots of text to force the page break.
Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text. Lots of text.
\begin{proof}\predisplaypenalty=9900
%Some more text to force the page break and get the "$a=b$." in the correct position.
Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some $a=b$.
\begin{align*}
%Something pretty long to force a new page whilst leaving a blank area.
a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b\\a&b
\end{align*}
\end{proof}
\end{document}