Related terms:
nasir
bolyai
obtuse
khayyam
saccheri
postulate
geometria
intersect
axiomatic
deductive
zhang heng
lobachevsky
right angle
lines through
quadrilateral
trigonometry
constructions
fifth postulate
straight lines
parallel lines
hyperbolic space
peano arithmetic
analytic geometry
elliptic geometry
euclidean geometry
hyperbolic geometry
pythagorean theorem
saccheri quadrilateral
incompleteness theorem
compass and straightedge
Wikipedia sources:
Parallel postulate
History of geometry
Euclidean geometry
Axiom
Non-Euclidean geometry
Hyperbolic geometry
History of mathematics
Context for words:
parallel
postulate
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