Comments on “Structural Invariant Subspaces of Singular Hamiltonian Systems and Nonrecursive Solutions of Finite-Horizon Optimal Control Problems”
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In this note it is shown that the main result of , concerning a characterization of a pair of structural invariant subspaces associated with the extended symplectic system, is a particular case of a result presented in  and  within a more general and rigorous context. We also analyse the proof of the main result of , and the way such result is used to accomodate the boundary conditions in the solution of a finite-horizon linear quadratic optimal control problem.
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