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The phrase "a proof of principle" is correct and commonly used in written English.
It typically refers to a demonstration or evidence that a certain idea, theory or concept is valid or can be effective in practice. It can be used in various contexts, such as scientific research, engineering, business, etc. Here is an example sentence: "The successful implementation of this prototype is a proof of principle for our new technology and paves the way for its commercialization."
Exact(39)
It is also a proof of principle.
This is a proof of principle study".
It's a proof of principle.
Dr. Brewer sees it as a proof of principle.
"This is a proof of principle," says Kang Pyo So.
Still, the experiment became known as a proof of principle.
Similar(21)
Valproic acid (VPA) is highlighted as a proof-of-principle.
The team has built a proof-of-principle device to test the idea.
DNA methylome profiling using neonatal dried blood spot samples: a proof-of-principle study.
It is a proof-of-principle demonstration of secure communication on a global scale.
And they've put their ideas into practice with a proof-of-principle demonstration.
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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