L_{infty} -and l_{infty} -stability of interconnected systems

Sufficient conditions for the L_{\infty} - and l_{\infty} -boundedness of nonlinear interconnected systems are established. Systems which may be viewed as an interconnection of single-loop feedback systems are considered. Overall boundedness conditions are phrased in terms of the margins by which each subsystem satisfies a certain boundedness condition. The existence of similar results for the L_{\infty}- and l_{\infty} -continulty of nonlinear interconnected systems is noted.