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+\documentclass{article}
+\usepackage{axiom}
+\begin{document}
+\title{\$SPAD/src/input matrix22.input}
+\author{The Axiom Team}
+\maketitle
+\begin{abstract}
+\end{abstract}
+\eject
+\tableofcontents
+\eject
+\section{License}
+<<license>>=
+--Copyright The Numerical Algorithms Group Limited 1991.
+@
+<<*>>=
+<<license>>
+
+)clear all
+-- this file shows nesting of matrices
+m:SQMATRIX(2,INT) := squareMatrix matrix [[0,1],[-1,0]]
+-- this determinant can be computed
+determinant m
+n:SQMATRIX(2,SQMATRIX(2,INT)) :=
+  squareMatrix matrix [[m,m**2],[m**3,m**4]]
+-- this determinant cannot be computed by Scratchpad II
+-- because there is no function that computes the determinant of a
+-- matrix whose entries belong to a noncommutative ring
+)set mes test off
+determinant n
+)set mes test on
+-- another level of matrix
+o:SQMATRIX(2,SQMATRIX(2,SQMATRIX(2,INT))) :=
+   squareMatrix matrix [[n,n**2],[n**3,n**4]]
+o ** 2
+-- add 2 to this matrix
+% + 2
+-- what is 2 as a matrix?
+o := 2
+@
+\eject
+\begin{thebibliography}{99}
+\bibitem{1} nothing
+\end{thebibliography}
+\end{document}