Definition:Below (Plane Geometry)

Definition
Let $a$ and $b$ be points in the cartesian plane $\R^2$.

Then:
 * $a$ is below $b$


 * the $y$ coordinate of $a$ is less than the $y$ coordinate of $b$.
 * the $y$ coordinate of $a$ is less than the $y$ coordinate of $b$.

Also see

 * Definition:Above (Plane Geometry)