Inner-minor transformation
R. Sharma, E.I. Jury · IEEE Transactions on Automatic Control · 1973
A general inner-minor transformation is presented. This transformation is based on a permutation matrix which preserves the determinants values of the corresponding inners and minors. Furthermore, for the root clustering problem, this permutation matrix takes a special simple form which preserves a certain feature in the innerwise matrix. For the sake of unification, it is shown in an example that the inner form is the unifying form.