Related articles:
Parallel postulate
Euclidean geometry
Projective geometry
Spherical geometry
Euclid
Riemannian geometry
Distance
Euclidean space
Hyperbolic geometry
Parallel (geometry)
Curvature
Manifold
H. P. Lovecraft
Russia
Key terms:
geometry
lines
work
postulate
model
points
space
prove
ab
plane
angles
hyperbolic geometry
saccheri
elliptic geometry
sphere
geometria
intersect
mathematician
parallel postulate
euclidean geometry
bolyai
mathematics
theorems
klein
gauss
khayyam
consider
converge
proofs
straight lines
affine
widely
equivalent
each other
elements
curvature
fiction
locally
universe
believed
fifth postulate
lines through
projective
lobachevsky
assumptions
riemannian geometry
any given line
hyperbolic space
these early attempts
saccheri quadrilateral
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