Definition:Equal Surface

Definition
Let $R$ be a region of space, which may be the interior of a body.

Let there exist a point-function $F$ on $R$ giving rise to a scalar field.

An equal surface is a surface $S$ embedded in $R$ at which, for all $P \in S$, $\map F P$ is constant.

Also known as
An equal surface is also known as a level surface.