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- For the concept of compactification in mathematics, see compactification (mathematics)
In string theory, compactification refers to "curling up" the extra dimensions (six in the superstring theory), usually on Calabi-Yau spaces or on orbifolds. The mechanism behind this type of compactification is described by the Kaluza-Klein theory. See also compact dimension. The formulation of more precise versions of the meaning of compactification in this context has been promoted by discoveries such as the mysterious duality.
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