Projective line
= Projective line
{wiki}
The projective line over a field $F$ is the set of one-dimensional subspaces of $F^2$ and may be identified with $F\cup\{\infty\}$.
= Projective line
{wiki}
The projective line over a field $F$ is the set of one-dimensional subspaces of $F^2$ and may be identified with $F\cup\{\infty\}$.