Abstract
A class of first order neutral delay differential equations are investigated, and sufficient condition is derived for all solutions to be oscillatory. This result solves an open problem in the literature.
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The author would like to express their sincere gratitude to the referee for a number of valuable comments and suggestions.
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Shoukaku, Y. Oscillation of First Order Neutral Differential Equations with Delay. Differ Equ Dyn Syst 31, 283–288 (2023). https://doi.org/10.1007/s12591-020-00531-x
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DOI: https://doi.org/10.1007/s12591-020-00531-x