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+//page 18
+//Example 1.11
+clear;
+close;
+clc;
+disp('I = m * m identity matrix');
+disp('A = m * n matrix');
+disp('I*A = A','Then,');
+disp('A * I = A');
+disp('0(k,m) = k * m zero matrix');
+disp('0(k,m) = 0(k,m) * A','Then,');
+disp('And, A*0(k,m) = 0(k,m)');
+//end