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Discover LudwigThe phrase "theories of" is grammatically correct and commonly used in written English.
It is typically used to introduce a topic or concept that has multiple theories surrounding it. Example: There are many theories of evolution, including Darwin's theory of natural selection and Lamarck's theory of acquired characteristics.
Exact(56)
Victorian theories of the afterlife.
There are theories, of course.
Distributive versus procedural theories of fairness.
There were various theories of acquiescence.
Theories of Punishment.
With conspiracy theories, of course.
Normative theories of categorization.
Similar(4)
Theory of Morals.
"The Theory of Everything"?
THEATER "Theory of Flight".
Not his theory of relativity.
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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