Hence, for each t that belongs to the intervals ( θ$_{p}$ + η, θ$_{p}$$_{+1}$ − η ) , p ∈ Z . The inequality η < θ/ 5 ensures that t + 3 η ∈ ( θ$_{p}$ + η, θ$_{p}$$_{+1}$ − η ) if | t − θ$_{p}$ | ≤ η. Now, by means of the inequalities (5.11) and (5.14) we attain for | t − θ$_{p}$ | ≤ η, p ∈ Z , that The last inequality implies that α is an ϵ − translation number of Π u ( t ) . Consequently, the SICNN (2.3) admits a unique almost periodic solution. □ Remark 5.1 The Bohr definition of almost periodicity is also suitable for the application of Lyapunov functional method and the technique of Young inequality [59] to show the existence, uniqueness and exponential stability of almost periodic solutions in CNNs. Consider the sequence θ = { θ$_{p}$ } defined as θ$_{p}$ = p + 1 4 | sin( p ) − cos( $_{p}$√$_{2)}$ | , p ∈ Z . Utilizing the technique provided in [77, 80], one can verify that the sequences { θ q p } , q ∈ Z , are equipotentially almost periodic. We take the function γ ( t ) with ζ$_{p}$ = θ$_{p}$. One can confirm that the conditions ( C 3) and ( C 9) hold with ¯ θ = 3 / 2 and θ = 1 / 2 , respectively. Let us take into account the SICNN in which i, j = 1 , 2 , 3 , f ( s ) = s 2 2 if | s | ≤ 0 . 1 , f ( s ) = 0 . 005 if | s | > 0 . 1 , τ = 0 . 3 , 16 dx$_{ij}$ dt = − a$_{ij}$x$_{ij}$ − ∑ C$_{kl}$ ∈ N$_{1}$ ( i,j ) C kl ij f ( x$_{kl}$ ( γ ( t ) − τ )) x$_{ij}$ + L$_{ij}$ ( t ) , (6.15)    a$_{11}$ a$_{12}$ a$_{13}$ a$_{21}$ a$_{22}$ a$_{23}$ a$_{31}$ a$_{32}$ a$_{33}$    =    9 3 5 6 5 4 3 12 9   $^{,}$ ‖ Π u ( t + α ) − Π u ( t ) ‖ ≤ ‖ Π u ( t + α ) − Π u ( t + α + 3 η ) ‖ + ‖ Π u ( t + α + 3 η ) − Π u ( t + 3 η ) ‖ + ‖ Π u ( t + 3 η ) − Π u ( t ) ‖ < ϵ. ‖ Π u ( t + α ) − Π u ( t ) ‖ < βη ≤ ϵ/ 3 (5.14) 6 An example