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Statements
1988
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equivariant sheaf cohomology of Grothendieck
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sequence of right derived functors of the invariant section functor
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Extensions of groupoids
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twists
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bifunctor Ext
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second cohomology
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existence of a long exact sequence
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twist functor
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actions of a groupoid on elementary \(C^*\)- bundles fibred over its unit space
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Morita equivalence
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Dixmier-Douady invariant
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Mackey obstruction
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equivalence of categories
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