Una aplicación del teorema de liberalización de hartman

In this note we consider the ordinary differential equation U' = AU +f(t, U), where A is a real, constant, n x n matrix with eigenvalues satisfying Reλ = 0. We assume that the solution U = 0 of the system U' =A U is stable. f is a C1 function, lim U→0 f(t, U) = 0 and lim U→0 Df(t, U) = 0 u...