OAI/Analysis/CircleDomains/Sobolev/ExteriorCircleAreaPositive.lean

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Principal normalization fixes the positive orientation of every exterior image circle: signed area is continuous, never zero, and positive on sufficiently large circles.

  1. lemma OAI.CircleDomainRigidity.exterior_circle_area_eventually_pos line 14
  2. lemma OAI.CircleDomainRigidity.exterior_circle_area_pos line 29
  3. lemma OAI.CircleDomainRigidity.exterior_jordan_area line 51