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A two-dimensional and nonlinear example about a tunnel-diode oscillator circuit [4]. It models the voltage drop V and the current I.
The original problem was to prove that all trajectories eventually reach a certain set and stay there. We transformed it to a reachability problem, using the state space [-0.1,0.6]×[-0.002,0.002] and the unsafety constraint V<-0.04\/V>0.54\/I<-0.0015\/I>0.00175.
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