This is a simple example with a clock variable.
Flow: (x',y',t')=(-5.5y+y2,6x-x2,1)Empty jump relationInit: 4 <= x <= 4.5/\y=1/\t=0Unsafe: (1 <= x< 2/\2< y < 3/\2 <= t <= 4) The state space: [1,5]×[1,5]×[0,4]
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