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math.GT2014
Transitional geometry
Athanase Papadopoulos, Norbert A'Campo
We develop a transitional geometry, that is, a family of geometries of constant curvatures which makes a continuous connec-tion between the hyperbolic, Euclidean and spherical geom…
math.MG2014★ 2 cited
On Klein's So-called Non-Euclidean geometry
Norbert A'Campo, Athanase Papadopoulos
In two papers titled "On the so-called non-Euclidean geometry", I and II, Felix Klein proposed a construction of the spaces of constant curvature -1, 0 and and 1 (that is, hyperbol…