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was suggested in 1976 as an abstract example of dynamical system possessing a strange attractor. Now it is well known that it may serve for description of dynamics of some simple physical systems like a particle in viscous medium kicked by pulses with amplitude depending on the instantaneous position of the particle. From the physical point of view realistic values of parameter b are positive. In the parameter plane chart colors designate periods (indicated by numbers), gray area corresponds to chaos, white - to divergence of iterations.
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