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Quadrance: measurement between lines
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First Steps in Hyperbolic Geometry - Universal Hyperbolic Geometry
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- 1 CONTENT SUMMARY: notion of perpendicularity @04:48 Perpendicularity via duality @05:33 Do the altitudes of a triangle meet in a point? @10:54 Quadrance: m'ment between points @15:14 exercise @18:41 r…
- 2 Introduction
- 3 Perpendicularity via duality
- 4 Quadrance: measurement between points
- 5 Quadrance: measurement between lines
- 6 remark on Beltrami-Klein model
- 7 Spread: measurement between lines
- 8 Pythagoras' dual theorem
- 9 Spread law
