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Discover LudwigThe phrase "theory applies" is grammatically correct and can be used in written English.
It is typically used to discuss how a particular theory or concept is relevant or applicable to a situation or scenario. Example: "According to the theory of supply and demand, the price of a product will increase when demand exceeds supply. This theory applies to the current market conditions, as we have seen a surge in demand for hand sanitizer during the pandemic, leading to higher prices."
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"The same theory applies to children's spaces.
"That's when chaos theory applies," Mr. Allan says.
The same theory applies when dressing the home.
The same theory applies to SAR values and wireless devices".
I think this theory applies to actual motion as well as the writing.
The same theory applies to an in-form defender facing a side struggling for goals.
Let's see if that same theory applies to technology in a fashion magazine.
The war demonstrates "that classical military theory applies only to the countries in which it was made, those of the advanced Western world".
Mr. Schechter and Dr. Smith's theory applies more to attacks with specific targets than to random ones like the Slammer worm.
What is more, the class of equations to which the theory applies contains several that are of central interest in mathematics and science.
And if Akamatsu's theory applies to a country's industrial mix, rather than its standard of living, Japan is well out in front.
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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