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We can define the output of the function directly:

let <math>f(x) : [[ℝ]] [[→]] [[ℝ]]</math> be given by <math>f(x) := x^2</math>.  The [[domain]] and [[codomain]] of <math>f</math> are both <math>[[ℝ]]</math>; the [[image]] is <math>\{y ∈ [[ℝ]] [[\mid]] y ≥ 0\}</math>.

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