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+//page 161

+//Example 5.8

+clc;

+clear;

+close;

+A = [1 2;3 4];

+disp(A,'A = ');

+d = det(A);

+disp(d,'det A = ','Determinant of A is:');

+ad = (det(A) * eye(2,2)) / A;

+disp(ad,'adj A = ','Adjoint of A is:');

+disp('Thus, A is not invertible as a matrix over the ring of integers.');

+disp('But, A can be regarded as a matrix over field of rational numbers.');

+in = inv(A);

+//The A inverse matrix given in book has a wrong entry of 1/2. It should be -1/2.

+disp(in,'inv(A) = ','Then, A is invertible and Inverse of A is:');

+//end