OAI/GroupTheory/PolycyclicRecognition/Algebra/InnerCentralizerMembership.lean

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The Lie subalgebra is the actual inner-action centralizer

The exact finite logarithm identifies the group condition with centrality of Sx-x. This connects the product decomposition to kernels of group extensions.

  1. theorem OAI.PolycyclicRecognition.mem_innerCentralizerLieSubalgebra_iff line 18