A positional characterization of the (n-1)-dimensional Sierpiński curve in (η ≠ 4)
A property of the Sorgenfrey line
A short proof of Parovičenko's theorem
An extension theorem for sober spaces and the Goldman topology.
An irrational problem
Given a topological space ⟨X,⟩ ∈ M, an elementary submodel of set theory, we define to be X ∩ M with topology generated by . Suppose is homeomorphic to the irrationals; must ? We have partial results. We also answer a question of Gruenhage by showing that if is homeomorphic to the “Long Cantor Set”, then .