Triple

Target class: null hypersurface
Context triple: [Cauchy horizon, instanceOf, null hypersurface]

• A. flat space-time
  Flat space-time is a conceptual class representing a four-dimensional continuum with zero curvature, where the geometry is described by the Minkowski metric and special relativity holds exactly.
• B. singularity theorem
  A singularity theorem is a result in general relativity that shows, under certain physical and geometric conditions, spacetime must contain singularities where curvature becomes infinite and classical physics breaks down.
• C. non-singular black hole model
  A non-singular black hole model is a theoretical description of a black hole whose core avoids the classical spacetime singularity, typically by invoking modified gravity or quantum effects that yield a finite, regular interior geometry.
• D. Eddington–Finkelstein coordinate system
  The Eddington–Finkelstein coordinate system is a reformulation of the Schwarzschild spacetime using null (lightlike) coordinates that smoothly extend across the event horizon, eliminating the coordinate singularity present in standard Schwarzschild coordinates.
• E. spacetime
  Spacetime is the four-dimensional continuum that unifies the three dimensions of space with time into a single geometric framework in which all physical events occur.
• F. None of above. chosen