Definition:Limit of Real Function/Limit at Infinity/Negative

Definition
Let $f$ be a real function defined on an open interval $\openint \gets a$.

Let $L \in \R$.

$L$ is the limit of $f$ at minus infinity :
 * $\forall \epsilon \in \R_{>0}: \exists c \in \R: \forall x < c: \size {\map f x - L} < \epsilon$

This is denoted as:
 * $\ds \lim_{x \mathop \to - \infty} \map f x = L$

Also see

 * Definition:Limit at Infinity