This paper considers the robust stability problem for linear continuous-tim
e descriptor systems with interval system matrices. We first derive some ne
cessary conditions for the considered interval descriptor system to be regu
lar, impulse-fret and stable. Then, under some constraints, a necessary and
sufficient condition is given by using the Kronecker product and mu -analy
sis. (C) 2001 Elsevier Science B.V. All rights reserved.