"Complex numbers." . . "WISCONSIN UNIV MADISON MATHEMATICS RESEARCH CENTER." . . "Functions(mathematics)" . . . . "Integrals." . . "Nonlinear differential equations." . . "Stability, periodicity and almost periodicity of solutions of nonlinear differential equations in banach spaces"@en . . . . "Conditions for the existence and stability of bounded solutions, periodic solutions and almost periodic solutions of certain nonlinear differential equations in Banach spaces are obtained. The dependence of these solutions on a parameter is also investigated from the point of view of continuity, measurability and summability. (Author)."@en . . . . . . . . . "Transformations(mathematics)" . . "Invariance." . . "Functional analysis." . .