The phrase "theoretical system" is correct and usable in written English.
It refers to a set of principles or ideas that explain a particular concept or phenomenon. It is typically used in academic or scientific writing. Example: "The researchers' proposed theoretical system for understanding human motivation has been widely accepted in the field of psychology."
It takes half an hour of earnest enquiry to get past the impenetrable theoretical system that underpins Coleman's composition, something he calls "harmolodics".
His work is concerned with a general theoretical system for the analysis of society rather than with narrower empirical studies.
In the theoretical system of traditional economics, any inequality between these sums would quickly work itself out.
The Maitri Upanishad outlined a practice of Yoga (a practical and theoretical system of ancient Indian philosophy) that consisted of breath control, the withdrawal of the senses (the voluntarily induced loss of sense perception), meditation, concentration, reasoning, and absorption.
In addition, Ladd's Psychology, Descriptive and Explanatory (1894) is important as a theoretical system of functional psychology, considering the human being as an organism with a mind purposefully solving problems and adapting to its environment.
All that was required was that the theoretical system touched the operational ground somewhere, eventually.
In "Gaming the Vote," Mr. Poundstone enumerates some of the major theoretical systems that could reshape voting.
For better or worse, the Malthusian theory of population was, nevertheless, incorporated into theoretical systems of economics.
As Susan Sontag has shown in "Illness as Metaphor," her study of the mythology of disease, all the major illnesses have prompted a moralistic and punitive response, and have given rise to entire theoretical systems based on phony psychologizing.
The appearance of the inflection point may help us to establish theoretical systems and boost the effect in practical application.
Showing his fluency in Italian, he then translates Brocchi directly on the subject of importance of theoretical "systems" in geological science.
