OAI/GroupTheory/PolycyclicRecognition/Finiteness/FiniteIndexTopHomology.lean

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4 declarations, 0 contain sorry, 0 declared as axioms

The index on top homology with induced orientation coefficients

The coefficient return map becomes multiplication by the subgroup index. Identifying it with subgroup inclusion is a separate bar-resolution step.

  1. def OAI.PolycyclicRecognition.finiteIndexOrientationHomEquiv line 21
  2. theorem OAI.PolycyclicRecognition.finiteIndexOrientationHomEquiv_symm_id line 28
  3. theorem OAI.PolycyclicRecognition.finiteIndexOrientationHom_return line 33
  4. theorem OAI.PolycyclicRecognition.finiteIndex_topHomology_return line 51