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Discover Ludwig"requires proof" is correct and can be used in written English.
You can use it to suggest that a person must provide evidence to support a claim, such as a statement that they have made. For example: "His claim that he had completed the work on time requires proof of completion."
Exact(60)
The Webster requires proof of employment.
Establishing maintenance -- or alimony -- requires proof, too.
A murder conviction requires proof of an intention to kill.
Instead, the law requires proof that repaying the loan would produce "an undue hardship".
Adulterous spouses rarely end up in jail, however, because conviction requires proof of intercourse.
It requires proof, and that, UEFA and the police said, is hard to verify.
The law requires proof that the shootings were intended to "intimidate the civilian population at large".
A conviction on that charge requires proof of intent to kill.
Of the 50 states, only Georgia requires proof of retardation beyond a reasonable doubt.
The fourth amendment to America's constitution requires proof of "probable cause" for an arrest.
The statute authorizing the sanctions requires proof that the bank official acted "willfully".
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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