Discrete Dynamics in Nature and Society / 2013 / Article / Fig 1

Research Article

Tangent-Free Property for Periodic Cells Generated by Some General Piecewise Isometries

Figure 1

(a) The illustration to the invariant disks packing of the Sigma-Delta map for the parameter . (b) The local magnification of the square , we can see that the disk packing is very “loose” and there is no tangencies between any pair of invariant disks.