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The phrase "a valid function" is correct and usable in written English.
It can be used in contexts related to mathematics, programming, or logic to describe a function that meets certain criteria or requirements.
Example: "In order to solve the equation, we need to ensure that we are working with a valid function."
Alternatives: "an acceptable function" or "a legitimate function".
Exact(4)
This results in a one-to-many mapping which is not a valid function, eliminating any regression technique which directly learns a non-linear function.
That's not a valid function of government?
They serve a valid function and allow for lower income workers to receive a better income.
If natural disaster warning isn't a valid function of government, then why should all of our tax dollars pay to warn places like New Orleans of impending disaster?
Similar(56)
Any symmetric, positive semidefinite function is a valid kernel function, resulting in many possible kernels - for example linear, polynomial, and diffusion kernels.
Any symmetric, positive semidefinite function is a valid kernel function, resulting in many possible kernels - for example, linear, polynomial, and diffusion kernels.
Although this function is not a valid kernel function [44], it can be used as a similarity function based on molecular graphs.
This results in valid kernel functions again, because a valid kernel function is replaced by another.
A valid test function, η t (z,d), is any function that fulfills all of the following properties: 1. (eta _{t} z,d): mathcal {X}times mathbb {R}^rightarrow [0,1]).
Note that, in order for (36) to be a valid survival function, it must be the case that x1/γh(x) is a non-decreasing function of x.
This mapping is accomplished, as previously stated, by using a valid kernel 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