Čech lifting below the first possible local cohomology degree

ID: cech-lifting-below-the-first-possible-local-cohomology-degree

For a finite cover whose nonempty intersections have zero sheaf cohomology in degrees , the displayed sequence is exact for . Apply the Čech cochain complex to a flasque resolution. Local primitives and successive primitives of their overlap differences reduce a class with zero restrictions to a Čech cocycle with values in the original sheaf. Vanishing in degree on all intersections is not needed.

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