Valuation Ring of Non-Archimedean Division Ring is Clopen/Corollary 1
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Theorem
Let $p$ be a prime number.
Let $\struct {\Q_p, \norm {\,\cdot\,}_p}$ be the $p$-adic numbers.
Then the $p$-adic integers $\Z_p$ is both open and closed in the $p$-adic metric.
Proof
The $p$-adic integers $\Z_p$ is the valuation ring induced by $\norm {\,\cdot\,}_p$ by definition.
By Valuation Ring of Non-Archimedean Division Ring is Clopen then the $p$-adic integers $\Z_p$ is both open and closed in the $p$-adic metric.
$\blacksquare$