是否可以將一頁的上邊距減小到最小？我嘗試使用
\vspace{-1.5em}
但它不像\hspace{}.誰能幫我解決這個問題？
答案1
我假設您前面有一個空白行，align如下例所示：
\documentclass{article}
\usepackage{amsmath,lipsum}
\begin{document}
\lipsum[1-4]
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris sit amet rutrum
velit, ac fermentum risus. Aliquam erat volutpat. Suspendisse tristique tempus
turpis vitae sollicitudin. Etiam mattis quis turpis eget feugiat. Praesent at
turpis sed nibh sodales facilisis. In fermentum scelerisque pulvinar. Quisque
vitae ultricies tortor. Aliquam a elit ante. Donec sagittis tincidunt eros,
eget eleifend ligula lobortis sit amet. Mauris vestibulum justo et volutpat
tempus. Aenean luctus turpis massa, id suscipit purus blandit non.
\begin{align}% Space between paragraph and align
f(x) &= ax^2 + bx + c \\
ix^2 + jx + k &= g(x) \\
f(x) &= ax^2 + bx + c \\
ix^2 + jx + k &= g(x)
\end{align}
\lipsum[5-7]
\clearpage
\lipsum[1-4]
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris sit amet rutrum
velit, ac fermentum risus. Aliquam erat volutpat. Suspendisse tristique tempus
turpis vitae sollicitudin. Etiam mattis quis turpis eget feugiat. Praesent at
turpis sed nibh sodales facilisis. In fermentum scelerisque pulvinar. Quisque
vitae ultricies tortor. Aliquam a elit ante. Donec sagittis tincidunt eros,
eget eleifend ligula lobortis sit amet. Mauris vestibulum justo et volutpat
tempus. Aenean luctus turpis massa, id suscipit purus blandit non.
\begin{align}% No space between paragraph and align
f(x) &= ax^2 + bx + c \\
ix^2 + jx + k &= g(x) \\
f(x) &= ax^2 + bx + c \\
ix^2 + jx + k &= g(x)
\end{align}
\lipsum[5-7]
\end{document}
從上面的例子可以看出，如果不留空行，則前面段落的最後一行將與align.
如果您確實需要使用負垂直間距，請確保您處於垂直模式。如果你是在頁面頂部，使用加星號的版本\vspace*。