Mapping between D
and Ƶ ( D
). (a) Mapping of D7 and its adjacent domains in Fig. 2 into the elements of Ƶ(D7). The empty circles on the boundary of Ƶ(D7) denote the candidate exit points. (b) The filled circles denote the exit points from Ƶ(D7), whereas the empty circles denote unstable stationary points that correspond to possible entrance points to Ƶ(D7). The single-headed arrows denote the direction of change of Z
, ∀l ∈ ℒ
in a neighborhood of the exit points.