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Discover LudwigThe phrase 'real-valued function' is correct and usable in written English.
You can use this phrase to refer to any mathematical function which takes on a real number as its output. For example: "In mathematics, a real-valued function is any function which outputs a real number or a set of real numbers."
Exact(60)
A real-valued function ║.,...,...
Let f be a real-valued function.
where q ∈ L ( 0, 1 ) is a real-valued function.
Now let φ : C → R be a real-valued function.
Let (f:Erightarrowmathbb{R}) be a real-valued function.
Let be a real-valued function defined on an interval.
A quasinorm is real-valued function on satisfying the following.
Let f be a real-valued function defined on ℝ.
Suppose that a real-valued function on,, is lower semicontinuous.
Then provided a real-valued function on, is lower semicontinuous.
Suppose that is an extended real-valued function.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com