How does one denote a restricted function?(adsbygoogle = window.adsbygoogle || []).push({});

For example, suppose I have a function [itex]F : \mathbb{R}\to\mathbb{R}[/itex], how would I denote a new function, such thatfis the restriction offto the positive semi-axis? Up until this point I would have just said thatFis the restriction offto the positive semi-axis, but it occurs to me that there should be a more concise way of writing it.F

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# Denote a restricted function?

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