M is a 4x4 matrix, M is attached to this project.
it is required to find :
1-sigma interns of R and T when determinant of a matrix M is zero.
2-Find a relation between R and T when Re(sigma) = 0.
k_s are the roots of the attached equation.
M1s represent the first row = [M11, M12, M13, M14] =[ik1 ik2 ik3 ik4]
and so on.