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Discover LudwigThe phrase "a proven fact" is correct and can be used in written English.
You can use it when you want to emphasize the certainty of a statement or assertion that has been backed up with evidence. For example: "It is a proven fact that increased physical activity helps to reduce the risk of developing heart disease."
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If you can't then admit that "Low Energy Nuclear Reaction" is a theory and not yet a proven fact.
While many advocates of organic feeding claim that it reduces the chances of the meat containing E. coli and other bacteria, this is not a proven fact.
We're a proven fact.
"Darwinian evolution is not a proven fact".
"It's a proven fact that light pollution is harmful and wasteful".
As she says: "It is a proven fact that after 50 women do dissolve".
It's a proven fact that a raincoat will hold its size.
But that is not a proven fact; it is an experimental proposition.
This is a matter of proof and plaintiff has not transformed its hypothetical assumption, by evidence, into a proven fact.
They all play harder in the second half -- it's a proven fact that's when the defenses are tired".
It's a proven fact that the food we eat can have a direct impact on our mood and serotonin levels.
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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