## Periodic solutions to a second-order differential equation with deviating arguments.(Chinese. English summary)Zbl 1027.34079

Summary: Using the theory of coincidence degree, the authors study some kind of periodic solutions to the second-order differential equation with deviating arguments $x''(t)+ f(t, x(t), x(t-\tau_0(t))) x'(t)+ \beta(t) g(x(t- \tau_1(t)))= p(t).$ {}.

### MSC:

 34K13 Periodic solutions to functional-differential equations 47N20 Applications of operator theory to differential and integral equations

### Keywords:

periodic solutions