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    Mathematics A-Level

    One-to-one

    What One-to-one means in Mathematics A-Level, as defined for AQA.

    Definition of One-to-one

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    Reference: AQA

    A property f must have on its domain for f⁻¹ to exist as a function; restricting the domain can achieve this.
    AQA · B: Algebra and functions (study guide)

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    Using One-to-one in the exam

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