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The phrase "theory for" is correct and usable in written English.
You can use it to refer to an explanation or set of ideas that is intended to account for certain facts or observations. For example: "The scientist proposed a new theory for the origin of life on Earth."
Exact(58)
"That's portfolio theory for them.
Quantum physics and string theory, for instance.
No great-man theory for Uncle Joe.
That, at least, has been the theory for years.
But it's more or less my theory for writing novels.
We need a new development theory for a new century.
Mr. Hoffman said he had a theory for the silence.
Taylor quotes Gartner's famous hype cycle theory for emerging technologies.
There had to be a theory for this.
Similar(2)
The model identification (e.g. System identification-theory for the user.
metal, modified pencil glide theory for f.c.c.
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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