OAI/Analysis/CircleDomains/Topology/RectangleNeighborhoods.lean

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2 declarations, 0 contain sorry, 0 declared as axioms

Compact rectangles form a neighborhood basis inside a planar open set; countably many of their interiors suffice to patch measurability.

  1. theorem OAI.CircleDomainRigidity.exists_closed_rectangle_inside_open line 13
  2. theorem OAI.CircleDomainRigidity.aestronglyMeasurable_on_open_of_rectangles line 27