OAI/GroupTheory/PolycyclicRecognition/Algebra/AbelianNormalFiniteDimension.lean

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The finite-dimensional endgame for a torsion-free abelian kernel

The quotient may be any finitely generated abelian group. Passing to a finite index subgroup removes its torsion, and the actual rational rank bounds the kernel's integral cohomological dimension.

  1. theorem OAI.PolycyclicRecognition.abelian_normal_torsionFree_virtual_finite_dimension line 22