metageometry
metageometrician
Euclideanism
affine geometry
noneuclidean geometry
Georg Friedrich Bernhard Riemann
Bernhard Riemann
Riemann
Riemannian geometry
elliptic geometry
inversive geometry
Euclid's postulate
Euclidean axiom
Euclidian space
Euclid's axiom
differentiable manifold
imaginary geometry
compact space
Euclideanness
absolute geometry
n space
autometry
root system
taxicab geometry
tropical geometry
nonorthogonality
non-Euclidean geometry
nonconvexity
central simple algebra
pseudoangle
quasifield
convex combination
orthant
solid torus
simplex
Lobachevsky
Nikolai Lobachevsky
geometricity
Euclidean plane
plane curve
Nikolai Ivanovich Lobachevsky
Cartesian space
quantum
k-cell
cubinvariant