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Extraphysical theory is a term used to refer to extraphysical mechanics and its branches inside physics as a whole, extraphysical theory is mainly used by physicists to refer to extraphysical mechanics as a theory, similar to string theory. Since extraphysical theory and string theory are really similar to each other, even some physicists even consider extraphysical theory is a fundamental theory for string theory such as quantum theory is a fundamental theory for classical physics.
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