What the doose is the matter?

FACT 1. Disjoint closed subsets of ℕN may be separated by disjoint clopen sets.

One day, I happened to catch a glimpse of my daughter Annie, age three, playing dress-up with her pals at the family day care program she attends twice a week. Each child had a hat on his or her head and was pretending to be a circus clown.

Along most of the Alpine subduction the European plate subducted below Greater Adria, however, towards the west, Greater Adria under-thrusted the European margin forming the proto-Apennine slab[…]