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Müger proved in 2003 that the center of a spherical fusion category Ꮿ of nonzero dimension over an algebraically closed field is a modular fusion category whose dimension is the square of that of Ꮿ. We generalize this theorem to a pivotal fusion category Ꮿ over an arbitrary commutative ring k, without any condition on the dimension of the category. (In this generalized setting, modularity is understood as 2-modularity in the sense of Lyubashenko.) Our proof is based on an explicit descriptiondoi:10.2140/pjm.2013.264.1 fatcat:pmyqfpd3bjeunhwwhxyl7sgeau