Definition:Convergent Sequence/Real Numbers

Definition
Let $\left \langle {x_k} \right \rangle$ be a sequence in $\R$.

$\left \langle {x_k} \right \rangle$ converges to the limit $l$ iff:


 * $\forall \epsilon \in \R_{>0}: \exists N \in \N: n > N \implies \left|{x_n - l}\right| < \epsilon$

where $\left\vert{x}\right\vert$ is the absolute value of $x$.

Also see

 * Real Number Line is Metric Space