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The phrase "abstract theories" is correct and usable in written English.
It can be used when discussing concepts or ideas that are not grounded in concrete reality, often found in academic or philosophical contexts.
Example: "The paper explores various abstract theories related to the nature of consciousness and perception."
Alternatives: "theoretical concepts" or "conceptual frameworks".
Exact(43)
"I am not interested in abstract theories of veterans benefits," Mr. Principi said.
Whereas the liberal consciously articulates abstract theories, the conservative instinctively embraces concrete traditions.
"Science and Religion Share Fascination in Things Unseen" (Essay, Nov. 8) speculates on an evolutionary basis for both the abstract theories embedded in religious belief and physicists' faith in their abstract theories.
This is a pragmatic problem, to which abstract theories of human rights to freedom provide no solution.
But economists do owe a lot of their mystique to abstract theories the uninitiated do not understand.
They made a lot more sense on their face than the abstract theories about germs and viruses that began to appear in the late 19th century.
Similar(15)
There is no abstract theory that can predict how people will react to an austerity programme.
He invaded Iraq on the basis of abstract theory, the very thing Burke warned against.
Hence, abstract theory, intuition and metaphors loom especially large in our thinking.
Capitalist ideology has ceased to be abstract theory and is made tangible in every object of desire set before us.
The gap is not unlike that between the abstract theory of computers and the basic properties of actual computers.
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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