OAI/GroupTheory/PolycyclicRecognition/Finiteness/PoincareTopHomology.lean

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Top homology of an integral Poincare duality group

The orientation representation is the regular-dual cokernel of the last resolution differential. Its underlying integral module is rank one, and maps from it represent top-degree homology with arbitrary coefficients.

  1. theorem OAI.PolycyclicRecognition.IsIntegralPoincareDualityGroup.topHomology_orientation line 23