Existence of Semiregular Topological Space which is not Completely Hausdorff
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Theorem
There exists at least one example of a semiregular topological space which is not a completely Hausdorff space.
Proof
Let $T$ be a simplified Arens square.
From Simplified Arens Square is Semiregular, $T$ is a semiregular space.
From Simplified Arens Square is not Completely Hausdorff, $T$ is not a $T_3$ space.
Hence the result.
$\blacksquare$
Sources
- 1978: Lynn Arthur Steen and J. Arthur Seebach, Jr.: Counterexamples in Topology (2nd ed.) ... (previous) ... (next): Part $\text I$: Basic Definitions: Section $2$: Separation Axioms: Additional Separation Properties