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Fig. 4.9 Excitable mode of the Belousov-Zhabotinsky medium. The concentration pulse bends
around an obstacle and passes through holes
The dynamic mode is much more complex and may become vibrational if the
intersection of the zero isoclines corresponds to an unstable state. In this case, the
evolution of the medium initially located at the point
a
(Fig.
4.8a
) reaches along the
stable branch of the S-shaped isocline the point (
u
01,
v
01). Here, stability is lost,
and the medium spontaneously jumps to the opposite stable branch and again tends
