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Clarification of a footnote of "On the generalized Nyquist stability criterion"

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2 Author(s)
Desoer, C.A. ; University of California, Berkeley, CA, USA ; Wang, Y.T.

Prof. E.A. Francis pointed out to the original authors that footnote 31 on p. 189 of the above-named article [ibid., vol. AC-25, pp. 181-196, April 1980]. The footnote stated (incorrectly) that the discriminant could only be zero at a finite number of points in C. This is false. A correct reasoning is presented.

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Automatic Control, IEEE Transactions on  (Volume:26 ,  Issue: 3 )