Associative Property

An operation $\star$ is associative if the way operands are grouped does not affect the result: $(a\star b)\star c=a\star (b\star c)$

• Example (Addition): $(2+3)+4=2+(3+4)$
• Example (Intersection): $(A\cap B)\cap C=A\cap (B\cap C)$

Not all operations are associative (e.g., subtraction, division).