Union

Definition

The set of elements that belong to $A$ , to $B$ , or to both sets.

Used by Edexcel and OCR

Specification P6 · Paper 1, Paper 2, Paper 3

Specification 6.04a · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)

The symbol $\cup$ , used to combine values belonging to either of two sets.
Revise: Quadratic Inequalities and Set Notation

1
Remember that union includes the intersection: members in both sets must appear in $A \cup B$ .
2
For two separate solution intervals, use “or” or the union symbol $\cup$ , not a single chained inequality.

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