Popular symbols for disjointness relation of two sets?
104898
Proper notation for distinct sets
109219
How do the sets $\emptyset\times B,\ A\ \times \emptyset, \ \emptyset \times \emptyset $ look like?
145273
Disjoint $AC$ equivalent to $AC$
31392
Examples and Counterexamples of Relations which Satisfy Certain Properties
22482
How can an ordered pair be expressed as a set?
30231
The boundary of union is the union of boundaries when the sets have disjoint closures
106756
Union and Intersection of Sets $A_{i}$ and $B_{j}$
107564
If two sets have a natural (asymptotic) density, does their union?
28539
Does any uncountable set contain two disjoint uncountable sets?
85338
Equivalence relations on classes instead of sets
140044
A set union find algorithm
57822
Number of ways to choose two disjoint subsets of a set
55661
Existence of two disjoint closed sets with zero infimal distance
143586
Is $[0,1]$ a union of family of disjoint closed intervals?
137921
Reflexivity, Transitivity, Symmertry of the square of an relation
11849
Size of a union of two sets
41899
Notation for: all subsets of size 2