OAI/Analysis/RieszRectifiability/Flatness/NonflatAnnularHyperplaneTangent.lean

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Nonflat hyperplane tangents with annular bounds

The hyperplane tangent construction retains both the global smooth annular bound and a quantitative bilateral nonflatness bound. The latter passes through tangent formation with the explicit loss from ε to ε / 64.

  1. theorem OAI.RieszRectifiability.exists_nonflat_annular_hyperplane_tangent line 22