Abstract
We consider algebras in a modular tensor category C . If the trace pairing of an algebra A in C is non-degenerate we associate to A a commutative algebra Z ( A ) , called the full centre, in a doubled version of the category C . We prove that two simple algebras with non-degenerate trace pairing are Morita-equivalent if and only if their full centres are isomorphic as algebras. This result has an interesting interpretation in two-dimensional rational conformal field theory; it implies that there cannot be several incompatible sets of boundary conditions for a given bulk theory.
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