Comments on ‘A note on the discrete Lyapunov and Riccati matrix equations’
Bong‐Hwan Kwon, Myung-Joong Youn · International Journal of Control · 1985
A theorem presented by Tran and Sawan (1984), which gives a lower bound for the determinant of the positive definite solution of the discrete algebraic Riccati matrix equation, is shown to be erroneous.