Oscillation criteria for first order nonlinear delay differential equations (Q1348172)

Oscillation criteria for the first-order nonlinear delay differential equations \(x'(t)+p(t)f(x(t-\tau _{1}),\dots ,x(t-\tau _{m}))=0\) and \(x'(t)-p(t)f(x(t+\tau _{1}),\dots ,x(t+\tau _{m}))=0\) are established. These results improve some known results in the literature. An example illustrating the results is given.