| Summary: | Fundamental structural properties are identified for a class of implicit two-dimensional (2-D) system models with a form that is closed under static local-state feedback and output-injection transformations. The structural properties are investigated in terms of quater-plane causal solutions given compatible boundary conditions, controlled and conditioned invariants, and the corresponding output-nulling and input-containing subspaces. As is well known, such concepts play an important role in systems theory and in the solution of several control and estimation problems.
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