OAI/GroupTheory/PolycyclicRecognition/Finiteness/BicomplexFiniteElimination.lean

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Finite elimination in a first-quadrant bicomplex

Exact rows imply exactness of the finite antidiagonal total complex. The proof removes the largest horizontal component and terminates after finitely many columns; no spectral-sequence convergence theorem is assumed.

  1. theorem OAI.PolycyclicRecognition.diagonal_leading_cycle line 20
  2. theorem OAI.PolycyclicRecognition.diagonal_cycle_bounded_boundary_of_exact_diagonal line 40
  3. theorem OAI.PolycyclicRecognition.diagonal_cycle_boundary_of_exact_diagonal line 91
  4. theorem OAI.PolycyclicRecognition.diagonal_cycle_bounded_boundary line 99
  5. theorem OAI.PolycyclicRecognition.diagonal_cycle_boundary line 105