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Oscillation and nonoscillation of advanced differential equations with variable coefficients. (English) Zbl 1013.34067
The authors study the scalar advanced delay differential equations $$x'(t)-p(t)x(t+\tau)=0$$ and $$x'(t)-\sum_{i=1}^n p_i(t) x(t+\tau_i)=0$$ with positive constants $$\tau,\tau_i$$ and nonnegative continuous functions $$p, p_i$$. Sharp sufficient conditions are shown for the oscillation and nonoscillation of the solutions. The results improve and extend the corresponding ones of G. Ladas and I. P. Stavroulakis [J. Differ. Equations 44, 134-152 (1982)].

##### MSC:
 34K11 Oscillation theory of functional-differential equations
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##### References:
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