OAI/GroupTheory/PolycyclicRecognition/Geometry/SmoothImmersionCancellation.lean

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Recovering smoothness through an injective differential

Only the finite-dimensional vector-space target needed for exponential coordinates is used. A linear left inverse followed by the ordinary inverse function theorem supplies the local smooth inverse along the image.

  1. theorem OAI.PolycyclicRecognition.contMDiffAt_of_comp_of_injective_differential line 25