Arbitrary Union and Intersection
29214
Infinite DeMorgan laws
75944
Overlapping pure functions
108957
Cardinality of a totally ordered union
120641
Intersection of three vector subspaces
32090
Equal intersection segments on circles
106455
intersection of infinite collection of finite sets?
150311
Intersection of two `std::map`s
103471
Efficient list intersection algorithm
140044
A set union find algorithm
23225
Union of connected subsets is connected if intersection is nonempty
54779
A simple algorithm for polygon intersection
150135
The intersection of an infinite number of subspaces is a subspace
89506
Union of disjoint sets : Equivalence relations
130157
How to calculate the intersection of two sets?
11849
Size of a union of two sets
106050
Finding a conformal map from the intersection of two disks to the unit disk.
144181
Given an arbitrary set $X$, can one always find an element outside $X$?