Mathematics A-Level

set-builder and interval notation

What set-builder and interval notation means in Mathematics A-Level, as defined for WJEC.

Definition of set-builder and interval notation

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Reference: WJEC

Intervals use [a, b] for closed, (a, b) for open, and mixed forms such as (a, b]; set-builder form is {x ∈ ℝ : 1 < x ≤ 5}.

WJEC · Overarching themes - Mathematical argument, language and proof

Topics that use set-builder and interval notation

Overarching themes - Mathematical argument, language and proof (WJEC A-Level)

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Using set-builder and interval notation in the exam

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