Geometry/Neutral Geometry

• Euclid's First Four Postulates
  
• Euclid's Fifth Postulate
  
• Incidence Geometry
  
• Projective and Affine Planes (necessary?)
  
• Axioms of Betweenness
  
• Pasch and Crossbar
  
• Axioms of Congruence
  
• Continuity (necessary?)
  
• Hilbert Planes
  
• Neutral Geometry
  

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