The phrase "any sort of theory" is correct and usable in written English.
It can be used when referring to a variety of theories without specifying which one.
Example: "In the field of psychology, any sort of theory can help us understand human behavior better."
Alternatives: "any kind of theory" or "any type of theory".
Ascertainment of the use (of a word, of a proposition), however, is not given to any sort of constructive theory building, as in the Tractatus.
And it's a collaborative industry, so just as much as I choose to invite a diversity of voices into every creative project that I do, I don't stand by any sort of auteur theory, and I'm not a dictatorial director.
Cherubs, presumably, are not part of any sort of quasi-scientific theory, yet this alone is no reason to think they might exist.
And Kant's most complete treatment of value, the second Critique's "On the Concept of an Object of Pure Practical Reason", appears to be a relentless attack on any sort of teleological moral theory.
We still lack a deep theory of how these aspects of intelligence function, the sort of theory that might underpin their replication in a computer.
New Labour passed the Freedom of Information Act with this sort of theory in mind, and it has proved very uncomfortable for all sort of people, the latest being David Laws.
Sacks reports that Edelman once said to him, "You're no theoretician", to which Sacks replied "I know … but I am a field-worker, and you need the sort of fieldwork I do for the sort of theory making you do".
Always seeking to outwit irate or concerned parents, he is hazy about ages on the grounds of his "disjointed sort of theory that all girls, in relation to their male opposites, are 2,000 years old when they are born".
The easiest way to understand the various sorts of propositional semantic theories is by beginning with another sort of theory: a theory of reference.
