OAI/GroupTheory/PolycyclicRecognition/Algebra/AbelianQuotientDimension.lean

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Finite-rank torsion-free abelian quotients preserve finite dimension

Exhaust the quotient by finitely generated free abelian subgroups and apply the explicit cyclic-extension bound to each preimage.

  1. theorem OAI.PolycyclicRecognition.cohomologicalDimension_le_of_abelian_quotient line 19