Circle
= Circle
{title2=$S^1$}
{wiki}
The circle is the subspace $S^1=\{z\in\mathbb C:|z|=1\}$, equivalently the quotient of a closed interval obtained by identifying its endpoints.
= Circle
{title2=$S^1$}
{wiki}
The circle is the subspace $S^1=\{z\in\mathbb C:|z|=1\}$, equivalently the quotient of a closed interval obtained by identifying its endpoints.