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On the history of the parallel problem and the non-Euclidean geometries. (Zur Geschichte des Parallelenproblems und der nichteuklidischen Geometrien.) (German)
Mathematikunterricht 56, No. 6, 3-15 (2010).
Classification: G90 G40 E40 A30
1
Geometry on the surface of a sphere. (Geometrie auf der Kugeloberfläche.) (German)
Mathematikunterricht 56, No. 6, 16-27 (2010).
Classification: G60
2
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