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    1982
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    Brown-Douglas-Fillmore theory
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    KK-theory of Kasparov
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    Heisenberg group
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    classification of extensions of C*-algebras
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    homological invariants
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    long exact sequence in K-theory
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    Atiyah-Hirzebruch spectral sequence for twisted K-theory
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    continuous trace
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    Dixmier-Douady invariant
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