OAI/Analysis/RieszRectifiability/Flatness/RelativePlaneDimensionDrop.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

Dimension drop inside a supporting plane

A hole in the support within a linear subspace gives a halfspace tangent and then a hyperplane tangent. Their support lies in a strictly smaller subspace while retaining growth, lower mass, annular bounds, and quantitative bilateral nonflatness.

  1. theorem OAI.RieszRectifiability.exists_relative_plane_dimension_drop line 22