IEEE Transactions on Automatic Control, Vol.44, No.7, 1417-1419, 1999
Comments on "linear quadratic regulators with eigenvalue placement in a vertical strip"
In the above-mentioned paper, a method was proposed for the design of linear feedback control such that all the poles of the closed-loop system lie in a vertical strip. There are errors in the conditions for the eigenvalues to lie in the open vertical strip and also in the proof of Theorem 1. We correct these inaccuracies.