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Discover LudwigThe phrase "functional equation" is correct and can be used in written English.
It is a mathematical term used to describe an equation in which the unknowns are functions. Here is an example of how it can be used in a sentence: "Solving functional equations is an important part of advanced calculus."
Exact(60)
The quadratic function satisfies the functional equation.
The function satisfies the functional equation (1.5) which is thus called a cubic functional equation.
The function satisfies the functional equation (1.5), which explains why it is called cubic functional equation.
Obviously, the function satisfies the functional equation (1.1), which is called a cubic functional equation.
A functional equation is called stable if any function satisfying a functional equation "approximately" is near to a true solution of the functional equation.
A functional equation involving the iterates of the unknown function is called an iterative functional equation.
And this functional equation will clearly show it to you.
The functional equation (1.5).
The functional equation.
The functional equation (1.10). is called a quadratic functional equation.
The quartic functional equation (1.3).
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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