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+//page 81
+//Example 3.12
+clc;
+clear;
+close;
+x = round(rand(1,2) * 10);
+x1 = x(1);
+x2 = x(2);
+T = [x1+x2 x1];
+disp(x1,'x1 = ');
+disp(x2,'x2 = ');
+printf('T(%d,%d) = ',x1,x2);
+disp(T);
+disp('If, T(x1,x2) = 0, then');
+disp('x1 = x2 = 0');
+disp('So, T is non-singular');
+disp('z1,z2 are two scalars in F');
+z1 = round(rand() * 10);
+z2 = round(rand() * 10);
+disp(z1,'z1 = ');
+disp(z2,'z2 = ');
+x1 = z2;
+x2 = z1 - z2;
+disp(x1,'So, x1 = ');
+disp(x2,'x2 = ');
+disp('Hence, T is onto.');
+Tinv = [z2 z1-z2]; 
+disp(Tinv,'inverse(T) = ');
+//end