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Lifting Properties in Skew-Product Flows with Applications to Differential Equations
註釋In this paper we wish to study the lifting properties of skew-product flows. These properties are particularly important in the study of non-autonomous ordinary and functional differential equations. For example, the question of the existence of a periodic solution for a differential equation with periodic coefficients is the same as asking whether the periodic structure of the coefficient space can be lifted to a periodic structure in the solution space.