Filters V: Wallman compactifications

As promised, let us talk about Wallman compactifications.  They extend the construction of the Stone-Čech compactification ßX, beyond discrete spaces, to all T₄ spaces.  The construction is very similar to what we have seen in Filters IV.  But brace yourself for the finale, which involves Stone duality and Johnstone’s Theorem!  See the full post.