Abstract
It is shown that a control system characterized by a differential equation of the form dot{x}(t) = A(t)x(t) + B(t)u(t) + f(t,x(t)) , whose linear part is controllable, is itself controllable provided the nonlinear function f satisfies a condition amounting to stating that its "dc gain" approaches zero as parallelxparallel ightarrow infty . The proof uses the Schauder fixed-point theorem.

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