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Oct 19, 2018 at 22:45 comment added Henno Brandsma @Joe For such spaces with a single non-isolated point we can just use a trivial monotone-normality operator $\mu(x,U)$. $\mu(x,U) = \{x\}$ for all isolated $x$ and $\mu(x,U) = U$ for the other point.
Oct 18, 2018 at 4:59 vote accept Joe
Oct 17, 2018 at 19:31 history answered KP Hart CC BY-SA 4.0