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An environment for visualising object oriented program execution providing concrete and abstract views of program structure and behaviour is described. Of particular novelty are dynamic views using a road map metaphor.

The structured singular values and skewed are the well-known mathematical quantities bridge gap between linear algebra system theory. It is fact that an exact computation of these NP-hard. NP-hard nature allow us to provide estimations lower upper bounds which guarantee stability instability feedback systems in control. In this paper, we present new results on dual characterization values. esti...