Open ray
= Open ray
{title2=$\{p+tv:t>0\}$}
A <ray> with its endpoint removed. In the <Argand plane>, fixing the <argument> of $z-z_0$ specifies an open ray because the <argument> of zero is undefined.
= Open ray
{title2=$\{p+tv:t>0\}$}
A <ray> with its endpoint removed. In the <Argand plane>, fixing the <argument> of $z-z_0$ specifies an open ray because the <argument> of zero is undefined.