Set Theory

Union (Set Theory)

Wiki: Union_(set_theory)

Symbol: ∪

A ∪ B

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Disjoint Example:

The union of A, B, C, D, and E is everything except the white area: {max-width: 500px, display: block, margin: 0 auto}

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Intersection (Set Theory)

Wiki: Intersection

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Set Difference

B \ A (set difference of B and A)

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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.

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