Definition:Horizontal Section of Function

Definition
Let $X$ and $Y$ be sets.

Let $f : X \times Y \to \overline \R$ be an extended real-valued function.

Let $y \in Y$.

We define the horizontal section $f^y$ of $f$ by:


 * $\map {f^y} x = \map f {x, y}$

for each $x \in X$.