Definition:Convergent Sequence/Note on Domain of N

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Definition

Let $\sequence {x_k}$ be a sequence.

$\displaystyle \lim_{n \mathop \to \infty} x_n \to l$

be the limit of $\sequence {x_k}$.

That is:

$\forall \epsilon \in \R_{>0}: \exists N \in \R_{>0}: n > N \implies \map d {x_n, l} < \epsilon$


Some sources insist that $N \in \N$ but this is not strictly necessary and can make proofs more cumbersome.


Sources