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Comments on "Explicit criterion for the positive definiteness of a general quartic form"

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2 Author(s)
Fei Wang ; Dept. of Appl. Math., Hong Kong Polytech. Univ., China ; Liqun Qi

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.

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Automatic Control, IEEE Transactions on  (Volume:50 ,  Issue: 3 )