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Discover LudwigThe phrase "are proof for" is correct and usable in written English.
It can be used to indicate that something serves as evidence or support for a particular claim or argument.
Example: "The results of the experiment are proof for the theory that climate change is accelerating."
Alternatives: "are evidence of" or "serve as proof of".
Dictionary
are proof for
noun
An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
Exact(2)
Rankin's supposed tears are proof for others of a calculated self-interest.
We do not claim that our results are proof for the consumption of vertebrate meat by gorillas, but we would like to point out that it is one possible explanation that can only be discarded after direct observations become possible.
Similar(58)
Due to these requirements, processes and devices that are proofed for manual inspection cannot be transferred to automated inspection.
This will be proof for many that Nick Clegg is indeed a latte-sipping, windsurfing, arugula [rocket]-munching Euro-snob.
The two rows of radishes came up identical, and this was proof for me that no God existed.
The stomach-dropping video was proof for which no one had known they were waiting: that below the waves the rigs also walked.
Now there is proof for her friends back home that Eloise really does exist at the Plaza Hotel — just as she does in the books.
Prior's proof for the Barcan formula adopts Łukasiewicz's rules for the introduction of the existential quantifier.
"It's important for us that it remains a Latvian company because it's proof for society that great things can be produced here.
"That was proof for us that we have a very good pizza".
Colorado would be proof for the country that Americans can hope to send a senator to Washington independent of corporate backing.
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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