(s, t)=
(1/2, x/2) if α < 1/2
(u, v)=
((1 + x)/2, (1 + x)/2) if α < 1/2
(y, z)=
(x/2, 1/2) if α < 1/2
(1/3, 1/3) if α = 1/2
if α = 1/2
(1/3, 1/3) if α = 1/2
(x, 1) if α > 1/2
(0, 0) if α > 1/2
(1, x) if α > 1/2
| (s, t)= | (1/2, x/2) if α < 1/2 | (u, v)= | ((1 + x)/2, (1 + x)/2) if α < 1/2 | (y, z)= | (x/2, 1/2) if α < 1/2 |
|
| (1/3, 1/3) if α = 1/2 |
|
|
| (1/3, 1/3) if α = 1/2 |
|
| (x, 1) if α > 1/2 |
| (0, 0) if α > 1/2 |
| (1, x) if α > 1/2 |