Characterisation of Non-Archimedean Division Ring Norms/Corollary 3

Theorem
Let $\struct {R, \norm {\, \cdot \,} }$ be a normed division ring with unity $1_R$.

$\norm {\,\cdot\,}$ is Archimedean :
 * $\sup \set {\norm {n \cdot 1_R}: n \in \N_{>0} } = +\infty$

where:
 * $n \cdot 1_R = \underbrace {1_R + 1_R + \dots + 1_R}_{\text {$n$ times} }$

Proof
By Characterisation of Non-Archimedean Division Ring Norms:
 * $\norm {\,\cdot\,}$ is Archimedean $\iff \sup \set {\norm {n \cdot 1_R}: n \in \N_{>0} } > 1$

By Corollary 2:
 * $\sup \set {\norm {n \cdot 1_R}: n \in \N_{>0} } > 1 \iff \sup \set {\norm {n \cdot 1_R}: n \in \N_{>0} } = +\infty$