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The union of two or more sets is a set containing all elements from the included sets without duplication. It is typically denoted by the symbol $\cup$.
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Intersection: The intersection of two or more sets is a set containing only the elements common to all included sets. Denoted by $\cap$.
Complement: The complement of a set A includes all elements not in A. It is usually denoted by $A^c$ or $\overline{A}$.
Disjoint Sets: Two or more sets are disjoint if they have no elements in common. Their intersection is an empty set.