Why is it impossible for a function to have fewer values in its domain than in its range?

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01-07-2017
Mathematics

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Why is it impossible for a function to have fewer values in its domain than in its range?

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BlueSky06 BlueSky06 · Answer 1 · 2017-07-14T14:57:23+02:00

It is impossible for functions to have fewer values in its domain than its range because from the definition of a function,
A function is an equation wherein for every independent variable there is one and only corresponding dependent variable.

For example, for x = 1 the value of y = 0. It is also possible for x = 2 to have a value of y = 0. However, it is impossible for x = 1 to have a value of y = 0 and 1.