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In this paper we study the existence of subharmonic solutions of the hamiltonian system $$J\dot{x}+u^{*}\nabla G(t,u\left(x\right))=e\left(t\right)$$ where $u$ is a linear map, $G$ is a $C^1$-function and $e$ is a continuous function.

In this paper we study the existence of subharmonic solutions of the Hamiltonian system $$J\dot{x}+u^{*}\nabla G(t,u\left(x\right))=e\left(t\right)$$ where  is a linear map, is a -function and  is a continuous function.