Solución
S
=
{
(
u
,
v
)
∣
u
2
+
v
2
≤
1
}
S = \big\lbrace (u, v)|u^2 + v^2 \le 1\big\rbrace
S
=
{
(
u
,
v
)
∣
u
2
+
v
2
≤
1
}