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Theoretical physics is a branch of physics used to create mathematical models of physical phenomena and compare them to practice as the main method of learning about nature. In this case, theoretical physics is an independent method of studying nature. However, this method does not use experiments to solve the basic laws of physics, but is a modeled method of studying nature. The basic objective laws and phenomena in nature are formed and accepted on the basis of observations and experimentally proven results.
The methodology of theoretical physics consists in separating basic physical concepts (for example, atom, mass, energy, entropy, field, etc.) and forming the laws of nature that connect these concepts in mathematical language.