A thread from the Geometry Forum newsgroup archive

(2-col.) Proofs (see also Sketchpad & Triangle Congruence)

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1. Two-column proofs by Bob Hayden on 01/23/95.
2. Re: Two-column proofs by John Conway on 01/24/95.
3. Re: Two-column proofs by Lou Talman on 01/24/95.
4. Re: Two-column proofs by Judy Roitman on 01/24/95.
5. Re: Two-column proofs by Heidi Burgiel on 01/24/95.
6. Re: Two-Column Proofs by Mark Saul on 01/24/95.
7. Re: Two-column proofs by John Conway on 01/24/95.
8. Re: Two-column proofs by John Conway on 01/24/95.
9. Re: Two-Column Proof by John Conway on 01/24/95.
10. Re: Two-column proofs by Walter Whiteley on 01/24/95.
11. Re: Two-column proofs by Pat Ballew on 01/25/95.
12. Re: Two-column proofs by Dave Wilson on 01/25/95.
13. 2-col. proofs by Bob Hayden on 01/25/95.
14. Formal Proofs in Geometry by Walter Whiteley on 01/25/95.
15. 2-column proof example by Annie Fetter on 01/25/95.
16. Re: 2-col. proofs by John Conway on 01/25/95.
17. Re: Two-Column Proof by W Gary Martin on 01/25/95.
18. Re: Two-column proofs by Lou Talman on 01/25/95.
19. Re: 2-col. proofs by Michael Keyton on 01/25/95.
20. Re: 2-col. proofs by John Conway on 01/26/95.
21. Re: Two-column proofs by Michelle Manes on 01/27/95.
22. Re: Two-column proofs by Andrei TOOM on 01/27/95.
23. Re: Two-column proofs by Lou Talman on 01/27/95.
24. Re: Two-column proofs by W Gary Martin on 01/27/95.
25. Re: Two-column proofs by Andrei TOOM on 01/27/95.
26. 2 column proofs by Ronda Delcamp (Lewandowski) on 01/28/95.
27. Re: 2 column proofs by B. Overkamp on 01/28/95.
28. Still two column proofs by John Benson on 01/28/95.
29. Re: 2 column proofs by Scott Smith on 01/28/95.
30. Re: 2 column proofs by Andrei Toom on 01/29/95.
31. Re: Two-column proofs by John Conway on 01/29/95.
32. Re: 2-col. proof by John Conway on 01/29/95.
33. Re: 2 column proofs by John Conway on 01/29/95.
34. Re: Two-column proofs by R. D. Foster on 01/29/95.
35. Re: 2 column proofs by Dan Hirschhorn on 01/30/95.
36. Re: Still two column proofs by Robin Mc Leod on 01/30/95.
37. Re: Still two column proofs by John Conway on 01/30/95.
38. Not quite two column proofs by Judy Roitman on 01/30/95.
39. Re: 2 column proofs by W Gary Martin on 01/30/95.
40. Re: 2-col. proofs by Bob Hayden on 01/30/95.
41. Re: 2 column proofs by Gary Tupper on 01/30/95.
42. Re: 2 column proofs by Walter Whiteley on 01/31/95.
43. Re: 2 column proofs by John Conway on 01/31/95.
44. Re: 2 column proofs by Walter Whiteley on 01/31/95.
45. Proof in High school by John Benson on 01/31/95.
46. 2-column proof by David Scott Powell on 02/01/95.
47. Re: 2 column proofs by W Gary Martin on 02/01/95.
48. 2-column proof by David Scott Powell on 02/01/95.
49. Re: Proof in High school by Robin Mc Leod on 02/01/95.
50. Re: 2 column proofs by Andrei TOOM on 02/01/95.
51. Re: 2-column proof by William T. Webber on 02/01/95.
52. Re: 2-column proof by John Conway on 02/01/95.
53. Re: 2-column proof by Gary Tupper on 02/02/95.
54. 2-column proof by David Scott Powell on 02/02/95.
55. Re: 2-column proof by Henri Picciotto on 02/02/95.
56. Re: 2 column proofs by Andrei TOOM on 02/02/95.
57. Re: 2-column proof by Michelle Manes on 02/02/95.
58. Re: 2-column proof by Dan Hirschhorn on 02/02/95.
59. Re: 2-column proof by John Conway on 02/02/95.
60. Re: 2-column proof by Michael Keyton on 02/02/95.
61. Re: 2-column proof by Michelle Manes on 02/02/95.
62. Re: 2-column proof by Jim Swiflt on 02/02/95.
63. Re: Proof in High school by John Conway on 02/03/95.
64. Re: 2-column proof by Bill Marthinsen on 02/03/95.
65. Two-column proofs by WYATT WENDELL on 02/03/95.
66. Two-column proofs by WYATT WENDELL on 02/03/95.
67. 2-column proof by Mark Saul on 02/05/95.
68. proving the obvious by Mark Saul on 02/05/95.
69. Proofs in UK Schools by Jim Swift on 02/07/95.
70. 2-column proofs: motivations/techniques by John Tant on 02/12/95.
71. Re: 2-column proof by John Conway on 02/12/95.
72. Re: 2-column proofs: motivations/techniques by David Scott Powell on 02/14/95.
73. Re: Proofs in UK Schools by John Conway on 02/14/95.
74. Re: 2-column proofs: motivations/techniques by LaVerta K Schmeling on 02/17/95.
75. Re: 2-column proofs: motivations/techniques by Allan Mundsack on 02/19/95.
76. Re: 2-column proofs: motivations/techniques by Lou Talman on 02/20/95.
77. Re: 2-column proofs: motivations/techniques by Judy Roitman on 02/20/95.
78. Re: 2-column proofs: motivations/techniques by Doris Schattschneider on 02/21/95.
79. Re: 2-column proofs: motivations/techniques by Kathryn Garrett on 02/21/95.
80. Re: 2-column proofs: motivations/techniques by John Tant on 02/21/95.
81. A comment from Jan Hall by Sarah Seastone on 06/20/95.

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12/02/96