# Model tp076
var x_1 >= 0;
let x_1 := 0.5;
var x_2 >= 0;
let x_2 := 0.5;
var x_3 >= 0;
let x_3 := 0.5;
var x_4 >= 0;
let x_4 := 0.5;
minimize obj: x_1^2 + 0.5*x_2^2 + x_3^2 + 0.5*x_4^2 - x_1*x_3 + x_3*x_4 - x_1 - 3*x_2 + x_3 - x_4;
subject to ci_1: 5 - x_1 - 2*x_2 - x_3 - x_4 >= 0;
subject to ci_2: 4 - 3*x_1 - x_2 - 2*x_3 + x_4 >= 0;
subject to ci_3: x_2 + 4*x_3 - 1.5 >= 0;
display obj;
solve;
display obj;
display x_1;
display x_2;
display x_3;
display x_4;
display obj + 4.681818181818182;
display x_1 - 0.2727272727272727;
display x_2 - 2.090909090909091;
display x_3 - 0;
display x_4 - 0.5454545454545455;