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Assessment and Future Directions of Nonlinear Model Predictive ...

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A Low Dimensional Contractive NMPC Scheme 529But one clearly has by definition <strong>of</strong> p c<strong>and</strong> (k + ):‖Fˆq(k)−1 (·,x cl (k + ),p c<strong>and</strong> (k + ))‖ 2 ∞ ≤‖Fˆq(k) (·,x cl (k), ˆp(k))‖ 2 ∞.Using the last equation in (13) givesV (x cl (k + )) ≤ V (x cl (k)) − α N min{ε, ‖Fˆq(k)(·,x cl (k), ˆp(k))‖ 2 ∞ }. (14)Case where ˆq(k) =1We shall first prove that each time this situation occurs, one necessarily has :x cl (k + ) ∈ ¯B(0,ρ(X)). (15)Pro<strong>of</strong> <strong>of</strong> (15) Consider a sequence <strong>of</strong> instant 0 = t 0

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