Order Topology is Normal
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Theorem
Let $\struct {S, \preceq}$ be a toset.
Let $\tau$ be the order topology on $S$.
Then $\struct {S, \tau}$ is normal.
Proof
From Linearly Ordered Space is Completely Normal, $\struct {S, \tau}$ is a completely normal space.
The result follows from Completely Normal Space is Normal Space.
$\blacksquare$