Preface

1. Parallel Lines  Push the infinite into the finite
2. Triangle   Move it to infinity

 3. Triangle and Inscribed Angle  (07/06/25) Not constant, Absolute unit length (1)
 4. Model  Make a disk model, Open and closed
 5. Disk and Hyperboloid  Interchangeable relations
 6. Equivalent Deformation,
    Comparison with Elliptic Geometry (1)  (07/04/14) Locus of vertex of a triangle
 7. Parallel Angle  What is it?
 8. Lobachevsky's Postulate  (07/07/19) How was it found? Can we draw infinity?
 9. Distance and Angle, Hyperbolic Trigonomery  (07/06/22) Dependent relations, Absolute unit length (2)
10. Equidistant Lines (1)  How does it look?  Parallel curves
11. Ultraparallel Lines  Common perpendicular
12. Tiling (tessellation)  (07/05/01) Reflection, Ideal triangle
13. Parallel Translation (1)  Get locus by reflection
14. Circle  Cutting hemisphere
15. Move Circle  Toward infinity
16. Extending Disk Model   (07/07/02) To get real hyperbolic plane
17. Horocycle (1)  Hemisphere, Translation, Equidistant lines (2)
18. Pseudo-sphere (1)  Is hyperbolic surface realized?
19. Upper Half-plane (1)  Relation with Poincare's disk, Digitized model
20. Horocycle (2)  Poincare's disk, Upper Half-plane (2)
21. Metric, Break Pythagorean Theorem  (07/06/13) Riemann, Mercator, Pseudo-sphere (2)
22. Mutual Relations among Models  Ray and chain 5 models
23. Curvature (1)  Osculating circle, Curvature of pseudosphere (1)
24. Curvature (2)  What happens if curvature changes?
25. Gauss-Bonnet Theorem  Curvature of pseudosphere (2)
26. Touchable Model  (07/06/20) Paper craft of true hyperbolic plane
27. H(+) Plane and Euclidean Plane  Visual comparison under unchanged length
28. Analytic Curve   Lambert's quardrangle
29. Hyperbolic Function  Source, Hyperbolic angle, Definition of logarithm
30. Inversion and Infinity (under construction)   What is the end of hyperbola?
31. Upper Half-plane (4) (under construction)   Can we come to Eucledean plane without jump?
32. Right Angled Polygon  (07/03/29) Infinite polygon
33. Dodecahedron  3-D tiling
34. Ideal Tetrahedron  3-D tiling

35. Projective Geometry (1)  Camera shot, Mobius strip
36. Mobius Strip (1)  If twisted?
37. Mobius Strip (2) 
38. Projective Geometry (2)  Quadratic curve
39. Crosscap (1)  Can Mobius strip be covered with a disk?
40. Crosscap (2)  Mobius strip and a disk as projective planes
41. Crosscap (3)  (06/06/08) Correspondence between Cross-cap
  and Mobius strip
42. Klein Bottle & Projective plane  (06/06/27) We cut and see their true colors.
43. Paper craft  (06/08/13) Cross-cap and twist
44. Projective Geometry (3)  Cross ratio (1), the Origin of model, Make Klein's disk
45. Projective Geometry (4)  Real and Imaginary sphere, Hyperboloid
46. Projective/Mobius Trans (under construction)   How do they change?
47. Projective Geometry (5) (under construction)   Principle of continuity, Erlangen Programme, Cross ratio (2)
48. Conclusion for Part 2 (under construction)

49. Figure-8 knot (1) (under construction)   topology
50. Figure-8 knot (2) (under construction)   Ultra sphere
51. Figure-8 knot (3) (under construction)   Formula of complement
52. Figure-8 knot (4) (under construction)   tetrahedron
53. Figure-8 knot (5) (under construction)   Hyperbolization (Gometrization)
54. Figure-8 knot (6) (under construction)   Where has the knot gone?
55. Figure-8 knot (7) (under construction)   horosphere
56. Summary (under construction)

Ending Notes
Post Comment / Free Software  (07/07/09)
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Aappendix / Practical Calculation (under construction)

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