Set Theory
From Union (Set Theory)
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Symbol: ∪
A ∪ B

Disjoint Example:
The union of A, B, C, D, and E is everything except the white area:

From Intersection (Set Theory)
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From Set Difference
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B \ A (set difference of B and A)

Examples
- {1, 2, 3} \ {1, 2, 4} = {3}
- 3 is in the first set but not in the second set.
- 4 is in the second set but not in the first set.
Children
