Set Notation and Operations
Learn set notation, union, intersection, and complement.
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Set Notation and Operations
What Is a Set?
A set is a collection of distinct objects called elements.
Examples:
- $A = \{1, 2, 3, 4\}$
- $B = \{3, 4, 5, 6\}$
Set Operations
| Operation | Symbol | Meaning | Example |
|---|---|---|---|
| Union | $A \cup B$ | All elements in A or B | $\{1,2,3,4,5,6\}$ |
| Intersection | $A \cap B$ | Elements in both A and B | $\{3, 4\}$ |
| Complement | $A'$ | Elements NOT in A | Depends on universal set |
| Difference | $A - B$ | Elements in A but not B | $\{1, 2\}$ |
📌 Quick Memory
U = Union means "combine everything" (add)
I = Intersection means "in common" (overlap)
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