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LaTeX - TikZ Weihrauch Reducibility Commutative Diagram
\begin{center}
\begin{tikzpicture}[scale=2.5]
% reducing to
\node (1) at (0,1) {$\omega^\omega$};
\node (2) at (1.5,1) {$\textbf{U}$};
\node (3) at (0,0) {$\omega^\omega \rangle$};
\node (4) at (1.5,0) {$\textbf{V}$};
% reducing from
\node (A) at (-1.5,1) {$\omega^\omega$};
\node (B) at (-3,1) {$\textbf{X}$};
\node (C) at (-1.5,0) {$\omega^\omega$};
\node (D) at (-3,0) {$\textbf{Y}$};
% id
\node (id) at (-0.3,0) {$\langle id ,$};
\path[->,font=\scriptsize]
% reducing from comm. diag
(A) edge node[above]{$d_{\textbf{X}}$} (B)
(A) edge node[left]{$F$} (C)
(B) edge node[left]{$f$} (D)
(C) edge node[below]{$d_{\textbf{Y}}$} (D);
\path[->,font=\scriptsize]
% reducing to comm. diag
(1) edge node[above]{$d_{\textbf{U}}$} (2)
(1) edge node[right]{$G$} (3)
(2) edge node[right]{$g$} (4)
(3) edge node[below]{$d_\textbf{V}$} (4);
% reduction path
\path[->,font=\scriptsize]
(A) edge node[above]{$H$} (1)
(-0.2,-0.1) edge [bend left] node[below]{$K$} (C);
%id path
\draw [->,font=\scriptsize] (A) edge [bend left] node[below]{$id$} (-0.3,0.15);
\end{tikzpicture}
\end{center}
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