2 cell arrow example for CAT

Material/CAT/2 cells arrows example.tex

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+% arara: pdflatex
+
+\documentclass{article}
+\usepackage{tikz-cd}
+
+\begin{document}
+%	\begin{tikzcd}[row sep=tiny]
+%		C(K,A) \arrow[r, "C(K,f)"] & C(K,B)
+%	\end{tikzcd}
+	\begin{tikzcd}[row sep=tiny]
+		W \arrow[dd, "f"'] & B \arrow[dd, "d"] \arrow[dr, "q"]&  \\
+		\arrow[r,maps to, shorten=1mm] 
+		& \ & A 
+		 \arrow[dl, "x"]\\
+		K & C & \\
+		g \arrow[r,maps to] & gf	
+	\end{tikzcd}
+\end{document}