• The $p$-Adic Integers. The ring of $p$-adic integers $\mathbb {Z}_{p}$ of is the inverse limit
    \[ \mathbb {Z}_{p}\cong \operatorname*{{\displaystyle \underset {\longleftarrow }{\operatorname*{\text{lim}}}}}_{n\in \mathbb {N}}\webleft (\mathbb {Z}_{/p^{n}}\webright ); \]

    see .


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