"Source: Text/Algebra/AlgMat.text";
"Line: 536";
"Date: Wed Sep 19 23:00:01 2018";
"Main: Thu May 25 10:02:38 2023";
// original file: Text/Algebra/AlgMat.text, line: 536
// Example: H90E4 ()
print "Example: H90E4";
ei := GetEchoInput();
SetEchoInput(true);
Q := RationalField();
A := MatrixAlgebra< Q, 3 | [ 1/3,0,0, 3/2,3,0, -1/2,4,3],
       [ 3,0,0, 1/2,-5,0, 8,-1/2,4] >;
B := sub< A | A.1 >;
Dimension(B);
assert $1 eq 3;
B: Maximal;
SetEchoInput(ei);
