J Austral Math Soc Ser B 32 pp377--381, 1991.

Oscillations of delay differential equations

K. Gopalsamy and G. Ladas

(Received 30 July 1989; revised 28 February 1990)

Abstract

Sufficient conditions are established for all solutions of the linear system

dyi(t)     n                                                          
¾¾ + å qij yj (t - tij) = 0,         i = 1, 2, ¼, n.
dt      j=1                                                      

to be oscillatory, where qij Î (-¥, ¥), tij Î (0, ¥), i, j = 1, 2, ¼, n.

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Authors

K. Gopalsamy
School of Mathematics, Flinders University, Bedford Park, S. A. 5042.
G. Ladas
Department of Mathematics, University of Rhode Island, Kingston, R. I., U.S.A.

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