Function
What Function means in Mathematics A-Level, as defined for AQA, Pearson Edexcel, WJEC.
Definitions of Function
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain Function in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: Pearson Edexcel
A mathematical mapping that assigns exactly one output value to each valid input value.
Maps each element of a domain to a unique element in the codomain.
A rule that assigns to each element of a set exactly one output.
A mapping which assigns exactly one output to each input in its domain.
A mapping in which each permitted input has exactly one output.
Topics that use Function
- B: Algebra and functions (AQA A-Level)
- OT1: Mathematical argument, language and proof (AQA A-Level)
- Algebra and functions (Pearson Edexcel A-Level)
- Overarching theme 1: Mathematical argument, language and proof (Pearson Edexcel A-Level)
- Overarching themes - Mathematical argument, language and proof (WJEC A-Level)
Related terms
Using Function in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Mathematics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge