Dierck-Ekkehard Liebscher
Relativity, geometry, and cosmology in pictures
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Gesamtschau
Distances
Reflections
Projective geometry
Conics
Minkowski
Lobachevski
Curvature
Michelson
Space-time
Special relativity
Try it yourself relativity
Mass and energy
Gravitation
Cosmology
Cosmic nucleosynthesis
Cosmic structure
Cosmic vacuum
Cosmic pinpoints
Time and entropy
Quantum physics
Physics supplement
Paper polyhedra