https://s0.wp.com/latex.php?latex=L+%3D+%5Clangle+%281%2C1%2C1%29+%5Crangle+%5Csubset+H+%3D+%5C%7B+%5Csum+x_i+%3D+0+%5C%7D+%5Csubset+V+%3D+%5Cmathbb%7BF%7D_3%5EI&bg=ffffff&fg=444444&s=0&c=20201002