Suppose that max t ∈ [ θ,θ + τ $_{]}$‖ y ( t ) − y ( t ) ‖ = ‖ y ( ξ ) − y ( ξ ) ‖ for some ξ ∈ [ θ, θ + τ ] . Define the number where M$_{g}$ = sup x ∈ Λ ‖ g ( x ) ‖ , and let For t ∈ [ θ $^{1}$, θ1 + Δ] , by favour of the equation one can obtain that The length of the interval J 1 = [ θ $^{1}$, θ$^{1}$+Δ] does not depend on x ( t ) , x ( t ) , and for t ∈ J 1 the inequality ‖ y ( t ) − y ( t ) ‖ > ϵ$_{1}$ holds, where ϵ$_{1}$ = τL$_{g}$ϵ$_{0}$ 12(2 + τL$_{f}$ ) . Consequently, the response system (2.3) is sensitive. □ [1] H. Poincaré, Les Methodes Nouvelles de la Mecanique Celeste, Vol. I, II, III, Paris, 1899; reprint, Dover, New York, 1957. [2] E.N. Lorenz, Maximum simplification of the dynamic equations, Tellus 12 (1960) 243–254. [3] E.N. Lorenz, Deterministic nonperiodic flow, J. Atmos. Sci. 20 (1963) 130–141. [4] B. Saltzman, Finite amplitude free convection as an initial value problem, J. Atmos. Sci. 19 (1962) 329–341. [5] S. Wiggins, Global Bifurcations and Chaos, Springer, New York, 1988. 12 References Δ = min { τ 2 , τL$_{g}$ϵ$_{0}$ 24( K$_{0}$L$_{f}$ + M$_{g}$ )(2 + τL$_{f}$ ) } , θ 1 =     ξ, if ξ ≤ θ + τ/ 2 ξ − Δ , if ξ > θ + τ/ 2 . y ( t ) − y ( t ) = ( y ( ξ ) − y ( ξ )) + ∫ t ξ [ f ( y ( s )) − f ( y ( s ))] ds + ∫ t ξ [ g ( x ( s )) − g ( x ( s ))] ds, ‖ y ( t ) − y ( t ) ‖ ≥ ‖ y ( ξ ) − y ( ξ ) ‖ − ∣ ∫ t ξ L$_{f}$ ‖ y ( s ) − y ( s ) ‖ ds ∣ − ∣ ∫ t ξ ‖ g ( x ( s )) − g ( x ( s )) ‖ ds ∣ > τL$_{g}$ϵ$_{0}$ 6(2 + τL$_{f}$ ) − 2Δ ( K$_{0}$L$_{f}$ + M$_{g}$ ) ≥ τL$_{g}$ϵ$_{0}$ 12(2 + τL$_{f}$ ) .