By using the symmetries that are built into physical systems, Lie group theory is a key tool for understanding and simplifying how they work. Complex differential equations that govern physical rules can be broken down into easier forms that don’t change by organizing symmetry groups in a planned way.  Finding the best systems of one-dimensional subalgebras is a quick way to get accurate answers, and reducing the problems to ordinary differential equations gives rise to structures that don’t change but still show the important dynamics.  Using numerical methods along with symmetry reduction also improves the speed and accuracy of calculations.