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Theoretical Physics, as a component of "Experimental Physics" in the hierarchy "Science/Mathematics/Experimental Physics", focuses on understanding and predicting physical phenomena through mathematical modeling and abstraction. It explores the fundamental principles governing the natural world, such as quantum mechanics and relativity, using advanced mathematical techniques to derive theories and equations that describe these phenomena. Theoretical physics often informs experimental physics by providing predictions that can be tested in laboratory settings. In this context, theoretical physics serves as a bridge between mathematics and experimental physics, allowing for a deeper understanding of the underlying mechanisms governing physical systems. It is an essential component of the broader field of science, contributing significantly to our knowledge of the universe and its workings.