Non Euclidean GeometryYou are currentlynot logged in Click here to log in 


One version of the fifth postulate is that given a line and a point outside it, there is exactly one line through the point parallel with the given line. We therefore get two alternative versions:
Axiom  (none)  (none)  
PoincaresDisc  (none)  
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Axiom EuclideanGeometry HyperbolicFunction 

(none)  Euclid  Function KurtGoedel TrigonometricFunction UnitCircle 
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