%
% Example 1 from Sec 3.1
%
A = [1 5 -2; 2 4 -1; 0 -2 0]
A11 = A([2,3],[2,3])
A12 = A([2,3],[1,3])
A13 = A([2,3],[1,2])
A(1,1) * det(A11) - A(1,2) * det(A12) + A(1,3) * det(A13)
det(A)
