Is the set of all integers with metric $d(m,n)=|m-n|$ a complete space?

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Consider the set of integers with a metric defined by $d(m,n)=|m-n|$.Is this set complete with respect to this metric?

If it is a metric, then I am stuck here. How can a Cauchy sequence have a limit in this set?

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Hint: What does $|m-n|<1$ imply for integers $m,n$?

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$|m-n|<1$ implies $m=n$ for all integers $m,n$. Therefore any Cauchy sequence in your space is eventually constant (why?), in particular convergent.