$A = \lbrace 1, 2 \rbrace$ and $B = \lbrace 3, 4 \rbrace$

Example · Elementary

Terms

Term	This example	Why
union	$A \cup B = \lbrace 1, 2, 3, 4 \rbrace$
intersection	$A \cap B = \emptyset$
set difference	$A \setminus B = \lbrace 1, 2 \rbrace$
disjoint union (of disjoint sets)	$A \cup B = \lbrace 1, 2, 3, 4 \rbrace$

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