Model hs80 Parameters l[1] = -2.3 l[2] = -2.3 l[3] = -3.2 l[4] = -3.2 l[5] = -3.2 u[1] = 2.3 u[2] = 2.3 u[3] = 3.2 u[4] = 3.2 u[5] = 3.2 xi[1] = -2 xi[2] = 2 xi[3] = 2 xi[4] = -1 xi[5] = -1 End Parameters Variables x[1:5] = xi[1:5], >=l[1:5], <=u[1:5] obj End Variables Equations x[1]^2+x[2]^2+x[3]^2+x[4]^2+x[5]^2 = 10 x[2]*x[3] - 5*x[4]*x[5] = 0 x[1]^3 + x[2]^3 = -1 ! best known objective = 0.0539498478 obj = exp( x[1]*x[2]*x[3]*x[4]*x[5] ) End Equations End Model