IEEE Transactions on Automatic Control, Vol.44, No.3, 587-587, 1999
Comments on "Observers for nonlinear systems in steady state"
In a recent paper,(1) a nonlinear observer has been constructed when an initial error is sufficiently small. However, the proof of Lemma 2.2(1) contains some errors. The authors provide a correct proof of the Lemma 2.2 and show that the results(1) still hold, but with reduced bounds of the initial error, states, and the new input.