A Čech cochain is a cocycle when its alternating coboundary vanishes. For a multiplicative one-cochain , this says on triple intersections.

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  1. Čech cochain complex
  2. Čech cohomology
  3. Sheaf cohomology
  4. Sheaf of modules
  5. Ringed space
  6. Algebraic geometry
  7. Geometry and topology
  8. Area of mathematics
  9. Mathematics
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