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We generalize the Bowen–Franks groups for topological Markov shifts to general subshifts as the Ext-groups for the associated C*-algebras. The generalized Bowen–Franks groups for subshifts are shown to be invariant under flow equivalence and, hence, invariant under topological conjugacy. They are regarded as the indices of Fredholm operators related to extensions of the associated C*-algebras so...
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