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.