We describe a method for proving the existence of periodic solutions to n-dimensional systems of the form z'(t) - Az(t) - Bz(t - tau) = F[z(t)]. The proposed method is based on the harmonic balance method and the theory of reproducing kernels. [References: 6]
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机译：我们描述了一种方法，用于证明形式为z'（t）-Az（t）-Bz（t-tau）= F [z（t）]的n维系统的周期解的存在。所提出的方法是基于谐波平衡方法和再现核的理论。 [参考：6]
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