Independent variables have possible values {domain, variable}|.
Dependent variables have possible values {range, variable}|.
Function values {critical value} at endpoint, undefined point, and optimum are the most-important values.
For function over interval, domain value gives range value that is between range values at interval endpoints {intermediate value theorem}.
Domain members can map to only one range member {correspondence rule, function} {rule of correspondence}, because function has only one value.
Function and inverse can have same number of elements in domain and range {equipotent set}.
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Date Modified: 2022.0225