Title :
Comments on "Explicit criterion for the positive definiteness of a general quartic form"
Author :
Wang, Fei ; Qi, Liqun
Author_Institution :
Dept. of Appl. Math., Hong Kong Polytech. Univ., China
fDate :
3/1/2005 12:00:00 AM
Abstract :
The purpose of this note is to point out that the result in the above paper (W. H. Ku, IEEE Trans. Autom. Control, vol. AC-10, no. 3, pp. 372-373, Jul. 1965) is incomplete, and to give a complete and improved result.
Keywords :
polynomials; explicit criterion; general quartic form; positive definiteness; Automatic control; Control systems; Interpolation; Linear matrix inequalities; Monte Carlo methods; Robust control; Robustness; Sampling methods; System identification; Uncertainty; Positive definiteness; quartic polynomial; roots;
Journal_Title :
Automatic Control, IEEE Transactions on
DOI :
10.1109/TAC.2005.843851
