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ODE: A4 DETEST
ID:  7bd06913e39a7b7cfb6e08858eedf374
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xd0 = x0*(20.0-x0)/80.0
x0(t) = 20.0/(((20.0-c0)/c0)*exp(-t/4.0)+1.0)
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IVP: 34
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x0 = 1.0
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IVP: 35
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x0 = [0.5,1.25]