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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
