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Discover Ludwig"are proof" is a valid part of a sentence in written English.
You can use it when you want to indicate that something provides evidence of something else. For example: "The results of the experiment are proof that our hypothesis was correct."
Dictionary
are proof
noun
An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
Exact(56)
These works are proof.
We are proof that every minute matters.
"The numbers are proof of that".
They are proof that God is here.
The Jordan bombings are proof of that.
Differences between retailers are proof that they, too, drive change.
Spira Mirabilis are proof that musical democracy works.
These CDs and DVDs are proof of all that.
They are proof of Mexico's burgeoning commerce with America.
Mrs. Hunter's sticks are proof of that claim.
Both his book and "Jerusalem" are proof of that.
More suggestions(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