Chapter 2: An ancient theorem and a modern question

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2.1 The Pythagorean theorem

2.2 Euclid’s postulates

2.3 Similar-areas proof of the Pythagorean theorem

2.4 Hyperbolic geometry: conformal picture

2.5 Other representations of hyperbolic geometry

2.6 Historical aspects of hyperbolic geometry

2.7 Relation to physical space

Further Reading

Art

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