## Summary

New oscillation criteria are established for the first order functional differential equation (*) y'(t)+p(t)y(g(t))=0and its nonlinear analogue. The results are presented so that a remarkable duality existing between the case where (*) is retarded (g(t)<t) and the case where(*) is advanced (g(t)>t) is apparent. Possible extension of the results for (*) to equations with several deviating arguments is attempted. Finally, it is shown that there exists a class of autonomous equations for which the oscillation situation can be completely characterized.

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Fukagai, N., Kusano, T. Oscillation theory of first order functional differential equations with deviating arguments.
*Annali di Matematica pura ed applicata* **136**, 95–117 (1984). https://doi.org/10.1007/BF01773379

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DOI: https://doi.org/10.1007/BF01773379