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Consider the rst-order linear di erential equation with several retarded argumentswhere the functions, τ k (t) < t for t ≥ t and lim t→∞ τ k (t) = ∞, for every k = , , . . . , n.Oscillation conditions which essentially improve known results in the literature are established. An example illustrating the results is given.

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New sufficient criteria are obtained for the oscillation of a non-autonomous first order differential equation with non-monotone delays. Both recursive and lower-upper limit types criteria are given. The obtained results improve most recent published results. An example is given to illustrate the applicability and strength of our results.

No abstract