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Discover LudwigThe phrase "is a proposition" is correct and usable in written English.
It can be used when defining or explaining a statement or idea that can be evaluated as true or false.
Example: "The statement 'All humans are mortal' is a proposition that can be tested for its truth value."
Alternatives: "is a statement" or "constitutes a proposition."
Exact(58)
What we are given here as input is a proposition in the propositional calculus and we have to decide whether it has a satisfying truth assignment.
"Lemma," the dictionary says, is "a proposition proved, or sometimes assumed, to be true".
This is a proposition, however, that the Lebanese have been unable to debate.
This is a proposition which very few major European allies buy.
For the traveller and the scholar alike, this is a proposition with a naggingly uncertain future.
That's the reason you cannot escape his art". Sehgal's work is a proposition, not a polemic.
It is a proposition, he said, and that proposition can and should be tested.
Broadly speaking, a threat is a proposition that issues demands and warns of the costs of noncompliance.
Regardless of my colleagues' differences with me, I hope that is a proposition on which we can all agree.
Similar(2)
A state of affairs for Plantinga is a proposition-like entity that either obtains — [Socrates' having been a philosopher], say — or does not — [There being Aliens], say.
This is a proposition that now needs to be tested.
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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