The paper presents the γ-δ Routh approximation for interval systems The interval γ's and δ's are evaluated for the higher order interval systems, and then an rth-order approximant is obtained by retaining the first r, interval γ's, and δ's. A numerical example illustrates the procedure.

Bijnan Bandyopadhyay

Department of Electrical Engineering

IIT Jodhpur

A. Upadhye

O. Ismail

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Journal	IEEE Transactions on Automatic Control
ISSN	00189286