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Discover LudwigThe phrase "such a theory" is correct and usable in written English.
It can be used when referring to a specific theory that has been previously mentioned or is understood in the context. Example: "In the realm of physics, such a theory can explain the behavior of particles at a quantum level."
Exact(60)
"Such a theory was inevitable.
Such a theory may come over as soft.
Such a theory would, however, be at odds with reality.
Such a theory will simply describe how the brain works.
Under such a theory, The Times would be seen as the victim of a crime.
Dr. Hengartner said there was no evidence to back such a theory.
Such a theory might conceivably be well-founded but this was a jarring outcome.
No writer better than Nabokov can help validate such a theory of modern fiction.
From Phillips to Manager Bobby Valentine to the players, the Mets have resisted such a theory.
The first case filed under such a theory, in 1997, was not successful.
There seems to have been little chance, though, of such a theory adding up in reality.
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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