Alkyl Problem (optimization problem) go icos AMPL = 0, <= 5; var x2 := 0.9, >= 0.9, <= 0.95; var x3 := 0.25, >= 0, <= 2; var x4 := 0.2, >= 0, <= 1.2; var x5 := 0.85, >= 0.85, <= 0.93; var x6 := 3, >= 3, <= 12; var x7 := 1.2, >= 1.2, <= 4; var x8 := 1.45, >= 1.45, <= 1.62; var x9 := 0.99, >= 0.99, <= 1.01010101010101; var x10 := 0.99, >= 0.99, <= 1.01010101010101; var x11 := 0.9, >= 0.9, <= 1.11111111111111; var x12 := 0.99, >= 0.99, <= 1.01010101010101; var x13 := 0.0714285714285714, >= 0, <= 1.6; var x14 := 0.0666666666666667, >= 0, <= 2; minimize obj : - 6.3*x1*x2 + 5.04*x3 + x4 + 0.35*x13 + 3.36*x14; subject to e2: x1 - 0.819672131147541*x3 - 0.819672131147541*x14 = 0; e3: x8*x12 - 3*x2 = -1.33; e4: x7*x11 + 22.2*x8 = 35.82; e5: 0.00038*x6^2 - 0.01098*x6 + x2*x10 - 0.325*x5 = 0.57425; e6: 0.98*x4 - (0.01*x1*x7 + x4)*x5 = 0; e7: x1*x9 - (1.12 + 0.13167*x6 - 0.0067*x6^2)*x3 = 0; e8: - x3*x6 + 10*x13 + x14 = 0; ]]> This is the alkyl problem taken from the ICOS distribution.