OAI/GroupTheory/PolycyclicRecognition/Geometry/AbelianFiniteRankRootCore.lean

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A finite root core for an abelian group with arbitrary torsion

Only finite rational rank is needed. Quotienting by the actual torsion subgroup gives a torsion-free root core, and finite lifts suffice upstairs.

  1. theorem OAI.PolycyclicRecognition.abelian_finiteRank_rootCore line 20