+ ••• + A ^ - r J , t^O. - Project Euclid

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tion (5) in case AiAj = AjAi, i,j = 0,1, • • -, m. For the sake of ... Let J\/( denote the closure in Mn of the algebra {p(A, B) : p is a poly- ... Control 5 (1967), 575-587.
ROCKY MOUNTAIN JOURNAL OF MATHEMATICS Volume 3, Number 1, Winter 1973

POINTWISE COMPLETENESS OF DIFFERENTIAL-DIFFERENCE EQUATIONS R. M . BROOKS AND K. S C H M I T T

1. Introduction. Let A^, i = 0 , 1 , * * -, m, be complex n X n matrices and let x be a complex n-dimensional column vector. Further, let 0 < TY < r 2 < • • * < Tm be given real numbers. We consider the system of differential-difference equations x'(t) = Ao*(*)+ A ^ t - T i )

+ ••• + A ^ - r J ,

t^O.

n

Let C denote n-dimensional complex Euclidean space and let fB denote the set of all continuous functions from [•— Tm, 0] into C n . If ip G i S , we denote by x(t;