Airports and smoking (I): Gatwick airport, London, UK

From a strictly mathematical point of view –set theory basics– a smoke ban “either within or outside a building” does actually imply a global ban – as either you are inside or outside the building.



So I was trying to locate the border between inside and outside areas, for it should be the only site where smoking is implicitly allowed. I noticed however fellow passengers weren’t being so literal about it...