Unit disk
= Unit disk
{wiki}
The open unit disk in the <Euclidean geometry>[Euclidean plane] is
$$
\{(x,y)\in\mathbb R^2:x^2+y^2<1\}.
$$
= Unit disk
{wiki}
The open unit disk in the <Euclidean geometry>[Euclidean plane] is
$$
\{(x,y)\in\mathbb R^2:x^2+y^2<1\}.
$$