The phrase "a sort of theoretical" is correct and usable in written English.
It can be used when describing something that is not strictly defined or is somewhat abstract in a theoretical context.
Example: "The study presents a sort of theoretical framework that helps to understand the complexities of human behavior."
Alternatives: "a kind of theoretical" or "a type of theoretical".
Some talked about it in a sort of theoretical sense, like the woman who said she wanted five children and didn't even have a boyfriend yet.
Thus a sort of theoretical stress concentration factor was calculated in function of the dimension and of the location of the spot facings of the clamp.
It is in fact possible to read the relationships between the two couples in the later work as a sort of theoretical distillation of those in the earlier one.
Things in themselves are therefore a sort of theoretical posit, whose existence and role are required by the theory but are not directly verifiable.
The bulk of the slide is pretty self-explanatory — just consider each bullet point a sort of theoretical entry bar for companies looking to raise a $1M+ round in a given category.
Nor does Herder have any elaborate account purporting to justify the moral intuitions at work in his political position as a sort of theoretical insight (in the manner of Kant's theory of the "categorical imperative" or Rawls's theory of the "original position," for example).
Competition for local space among species also might slow down invasions and prevent occupancy by a species that would otherwise colonize a patch and adapt to the changing climate, but we lack any sort of theoretical treatment to indicate this suggestion with certainty.
Given the stakes for physics, he said, it would not be proper to attempt any sort of theoretical interpretation of the results.
The artists associated with the movement wanted to reassert the primacy of aesthetic concerns in art, to make art that was beautiful and that didn't require any sort of theoretical framework for understanding.
Now what remain to be done is a sort of inverse theoretical study about the nature of non-existing chemical bond among the different parts of this supramolecular species, although they are in close contact each other.
