  The Galois group of an infinite Galois extension has a natural topology,
called the Krull topology, which has the important property of being profinite.
It is impossible to talk about Galois representations, and hence the Langlands
Program, without first defining the Krull topology. We explain our
formalisation of this topology, and our proof that it is profinite, in the Lean
3 theorem prover.
