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References to 'parallelism of two planes'
1. $I$-adic topology by mathcam
2. affine geometry by CWoo
3. affine transformation by matte
4. an outline of Hilbert's programme by gribskoff
5. angle between two lines by pahio
6. Cassini oval by pahio
7. catacaustic by pahio
8. category of small categories by CWoo
9. circular helix by rspuzio
10. cone in $\mathbb{R}^3$ by pahio
11. conformality of stereographic projection by pahio
12. conic section by drini
13. conjugate diameters of ellipse by pahio
14. construction of fourth proportional by pahio
15. convolution by PrimeFan
16. corollary of Morley's theorem by drini
17. cylinder by stevecheng
18. De Bruijn--Erd\H{o}s theorem by marijke
19. Desargues' theorem by drini
20. equation of plane by pahio
21. error function by rspuzio
22. Euclidean geometry of space by pahio
23. Euclidean transformation by CWoo
24. example of using Lagrange multipliers by pahio
25. generalized toposes with many-valued logic subobject classifiers by bci1
26. generatrices of hyperbolic paraboloid by pahio
27. gradient by CWoo
28. harmonic mean in trapezoid by pahio
29. high school mathematics by matte
30. homothetic by drini
31. incidence geometry by CWoo
32. intersection of quadratic surface and plane by pahio
33. level curve by pahio
34. line in plane by matte
35. line in space by pahio
36. Lobachevsky's formula by vmoraru
37. median of trapezoid by pahio
38. metalanguage by yesitis
39. normal of plane by pahio
40. osculating curve by pahio
41. parabola by mps
42. parallel and perpendicular planes by pahio
43. parallel curve by stitch
44. parallel postulate by vmoraru
45. parallelism of line and plane by pahio
46. parts of a ball by pahio
47. Pascal's triangle by Koro
48. pencil of conics by pahio
49. Plato's mathematics by milogardner
50. prismatoid by Mathprof
51. proof of arithmetic-geometric means inequality using Lagrange multipliers by stevecheng
52. proof of Ceva's theorem by yark
53. proof of Pick's theorem by giri
54. properties of parabola by pahio
55. properties of parallel curves by pahio
56. quadratic surfaces by pahio
57. relation reduction by Jon Awbrey
58. Richard Feynman by Mravinci
59. slope by pahio
60. supercomputers by bci1
61. supplementary chords by pahio
62. surface normal by pahio
63. surface of revolution by pahio
64. tactical decomposition by marijke
65. tangent of conic section by pahio
66. tangent space by rmilson
67. triangle mid-segment theorem by pahio
68. truncated cone by pahio
69. uncertainty principle by pahio
70. vector-valued function by pahio
71. volume as integral by pahio
72. volume of ellipsoid by pahio
73. Why Study Egyptian Fraction Mathematics by milogardner