Affiliation:
1. Department of Mathematics, University of Ioannina, 451 10 Ioannina, Greece
Abstract
In this paper, a survey of the most interesting conditions for the oscillation of all solutions to first-order linear differential equations with a retarded argument is presented in chronological order, especially in the case when well-known oscillation conditions are not satisfied. The essential improvement and the importance of these oscillation conditions is also indicated.
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