Why intersection of nothing is everything?
36881
Empty intersection and empty union
27107
intersection of the empty set and vacuous truth
108488
Why aren't vacuous truths just undefined?
63351
Intersection reports invalid geometries
38807
Does set difference distribute over set intersection?
132692
Nonempty set mapped to $\emptyset$ and vice-versa
26008
Why there is a unique empty set?
44178
Why is light invisible?
112817
Two circles intersection
84382
Sole minimal element: Why not also the minimum?
23807
WKT: What is the reasoning behind the concept of a POINT EMPTY?
113640
Why is there this strange contradiction between the language of logic and that of set theory?
74077
A intersection (A union B)
38118
Intersection of java.util.Map
4213
The set that only contains itself
70538
Intersection and union of simply connected domain
69329
Something versus anything