On the observability codistributions of a nonlinear system

  title={On the observability codistributions of a nonlinear system},
  author={Claudio De Persis and Alberto Isidori},
The purpose of this is to introduce the notion of observability codistribution for a nonlinear system, which extends the (dual of the) notion of “unobservability subspace”. Then, we study its properties, which bear important similarities with a number of properties which render the notion of unobservability subspace powerful in the solution of certain design problems. 
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