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What is a set?
A well-defined collection of distinct objects called elements
What is a null set (empty set)?
A set with no elements, denoted by {} or φ
What is a universal set?
The set that contains all elements under consideration
What is a subset?
Set A is a subset of B if every element of A is also in B, written A ⊆ B
What is the union of two sets A and B?
All elements that are in A or B or both, written A ∪ B
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