OAI/Geometry/EinsteinFour/MetricDoubleCoverModels.lean

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2 declarations, 0 contain sorry, 0 declared as axioms

The two-model cover reduction without Euler-characteristic assumptions. A free deck involution cannot act isometrically on the Fubini--Study model.

  1. theorem OAI.PositiveEinsteinFour.MetricDoubleCover.not_projective line 23
  2. theorem OAI.PositiveEinsteinFour.MetricDoubleCover.classified_of_two_models_direct line 45