Theoretical investigation is a research area that focuses on developing theoretical models, concepts, and frameworks to explain and understand various phenomena, processes, or systems. This research typically involves using mathematical or computational methods to analyze, interpret, and predict patterns, relationships, and behaviors in a given subject area. Theoretical investigations aim to uncover underlying principles, laws, or rules that govern a particular domain of study, and can be used to generate new hypotheses, guide empirical research, or inform practical applications. This research area is essential for advancing knowledge and understanding in a wide range of disciplines, including physics, biology, economics, and social sciences.