摘要

The existence of anti-periodic solutions of the following nonlinear impulsive functional differential equations @@@ x'(t) + a(t) x(t) = f(t, x(t), x(alpha(1)(t)),..., x(alpha(n)(t))), t is an element of R, @@@ Delta x(t(k)) = I-k(x(t(k))), k is an element of Z @@@ is studied. Sufficient conditions for the existence of at least one anti-periodic solution of the mentioned equation are established. Several new existence results are obtained.