ξ
universal set - all the numbers used in the entire diagram
∅
empty set - nothing in it
A
everything in A
A’
not in A
B
everything in B
B’
not in B
A∩B
intersection of A and B
(A∩B)’
not in the intersection
AUB
union of A and B, anything in both of them
(AUB)’
everything not in the union of A and B
AUB’
everything in A or not in B
(AUC)’U(A∩B∩C’)
everything not in A or C, or in the intersection of A and B