Dear Professor Skogestad,
I would like to inform you that in your book ''Multivariable feedback
control '' in page 505 in the equation (A.44), there is a mistake. This
relation is correct only when the matrix AB is full rank. If you want I
can send you an example.
Yours sincerely
Batool Labibi
Received on Thu Aug 17 17:58:49 2000
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