Code:
\documentclass[11pt,a4paper]{article}
\usepackage{tikz}
\usetikzlibrary{matrix}
\begin{document}
\begin{tikzpicture}[>=stealth,thick,sloped]
\matrix (dummy) [%
matrix of math nodes,
column sep=2cm,
row sep=2cm,
text width=2cm,
text centered,
font=\Large
] {%
& \sqrt{x^2+y^2} & \\
A_1 & & \int_a^b f(x)\,dx \\
};
\draw[->] (dummy-1-2) to[bend right=10pt] (dummy-2-1) node[midway,above] {1};
\draw[->] (dummy-2-1) to[bend right=10pt] (dummy-1-2) node[midway,below] {1};
\draw[->] (dummy-1-2) -- (dummy-2-3) node[midway,above] {2};
\draw[->] (dummy-2-1) -- (dummy-2-3) node[midway,below] {3};
\end{tikzpicture}
\end{document}
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