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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=== | |||
== Chapter 3 Kinds of number in the physical world == | == Chapter 3 Kinds of number in the physical world == |
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