Trumpf, Jochen; Helmke, Uwe; Fuhrmann, P A
A compactification of the set of conditioned invariant subspaces of fixed dimension for an observable pair (C,A) is proposed. It contains the almost conditioned invariant subspaces of the same dimension. In certain cases the compactification is shown to be smooth and a complete geometric description is given in the case of a single-output system.
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