答案1
我建议tikz-cd
这个图表。使用箭头类型-
作为线条,并<->
进行双射。
amsmath
需要该包(可能已经在您的文档中) \DeclareMathOperator
,以获得适当的间距和形状Gal
。
\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz-cd}
\DeclareMathOperator{\Gal}{Gal}
\begin{document}
Let $K/F$ be a Galois extension and set $G=\Gal(K/F)$. Denote by $E$ the subfields of $K$ containing $F$ and $H$ the subgroups of $G$. Then there is a bijection:
\[
\begin{tikzcd}
K\arrow[d, -] & 1\arrow[d, -]\\
E\arrow[d, -]\arrow[r, <->] & H\arrow[d, -]\\
F & G
\end{tikzcd}
\]
given by the correspondence
\end{document}
答案2
答案3
无需“花哨”的包装,避免图像中出现不一致,
\documentclass{article}
\usepackage{amsmath}
\DeclareMathOperator{\Gal}{Gal}
\begin{document}
Let $K/F$ be a Galois extension and set $G=\Gal(K/F)$.
Denote by $E$ the subfields of $K$ containing $F$ and $H$
the subgroups of $G$. Then there is a bijection
\[
\begin{array}{ccc}
K && 1 \\
\Bigl| && \Bigl| \\ \noalign{\vspace{2pt}}
E & \leftrightarrow & H \\
\Bigl| && \Bigl| \\ \noalign{\vspace{2pt}}
F && G
\end{array}
\]
given by the correspondence
\[
\begin{aligned}
E &\rightarrow \{\text{elements of $G$ fixing $E$}\} \\
\{\text{the fixed field of $H$}\} &\mspace{-1mu}\leftarrow H
\end{aligned}
\]
\end{document}
请注意\mspace{-1mu}
,这是为了避免箭头不对齐的印象。还请注意使用内部数学模式\text
来获得正确的斜体字母,而不是图像中错误的直立字母。
但是,由于您可能需要其他图表,可能比上面的图表更复杂,因此学习基础知识tikz-cd
要好得多。