Overview

one-to-many


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A rule which associates a single member of the domain of more than one number of the range. Where the rule is acting on numbers, a one-to-many mapping is not a function. For example, tan−1x takes not only the principal value, α, returned by a calculator, lying between −90 ° and+90°, but also α ± 180n for any integer n.

Subjects: Mathematics.


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