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ODE: Lambert 2
ID:  1b5613f8a7fb53e23af656bea8b3e289
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xd0 = 1.0/x0-x1*exp(x2**2)/(x2**2)-x2
xd1 = 1.0/x1-exp(x2**2)-2.0*x2*exp(-x2*x2)
xd2 = 1.0
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IVP: 117
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x0 = 1.0
x1 = 0.3678794412
x2 = 1.0
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IVP: 125
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x0 = [0.9,1.1]
x1 = [0.2678794412,0.4678794412]
x2 = 1.0