I am wondering about diagram for example 100, Minimal Hausdorff Topology.
The "special" basis neighborhoods in the diagram do not seem to coincide with the defining conditions.
The second coordinate has j>n for that n indexing the basis neighborhood, but the diagram seems to indicate j<n.
Also, if I am correct about the error in the diagram, then should not the inequality be changed to j>=n so that there is a basis neighborhood associated with the first row of the diagram as with every other row?
I am probably just misreading the definition. But it has me confused.