This discussion of the value of teaching two-column proofs in particular and proofs in general was followed by a short essay in response by Mark Saul on "Proving the Obvious."

Previous Topics || geometry.pre-college

Two overlapping discussions took place:

(1) Two-column proofs
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.

(2) Sketchpad & Triangle Congruence
1. Sketchpad & Triangle Congruence by Ben Preddy on 01/23/95.
2. Re: Sketchpad & Triangle Congruence by Heidi Burgiel on 01/22/95.
3. Re: Sketchpad & Triangle Congruence by Art Mabbott on 01/23/95.
4. Re: Sketchpad & Triangle Congruence by Art Mabbott on 01/23/95.
5. Re: Sketchpad & Triangle Congruence by Ronald S. Tiberio on 01/23/95.
6. Re: Sketchpad & Triangle Congruence by John Conway on 01/23/95.
7. Re: Sketchpad & Triangle Congruence by Judy Roitman on 01/23/95.
8. Re: Sketchpad & Triangle Congruence by William T. Webber on 01/23/95.
9. Re: Sketchpad & Triangle Congruence by Lou Talman on 01/23/95.
10. Re: Sketchpad & Triangle Congruence by J. Evans on 01/23/95.
11. Re: Sketchpad & Triangle Congruence by Walter Whiteley on 01/23/95.
12. Re: Sketchpad & Triangle Congruence by Art Mabbott on 01/23/95.
13. Re: Sketchpad & Triangle Congruence by Doris Schattschneider on 01/23/95.
14. How we teach geometry by Bob Hayden on 01/23/95.
15. High School Proof by Rex Boggs on 01/24/95.
16. Re: How we teach geometry by John Conway on 01/24/95.
17. Re: Sketchpad & Triangle Congruence by Dan Hirschhorn on 01/24/95.
18. Re: Sketchpad & Triangle Congruence by Margaret Sinclair on 01/24/95.
19. Re: Sketchpad & Triangle Congruence by Annie Fetter on 01/24/95.
20. Re: Sketchpad & Triangle Congruence by John Conway on 01/24/95.
21. Re: Sketchpad & Triangle Congruence by John Conway on 01/24/95.
22. Re: Sketchpad & Triangle Congruence by John Conway on 01/24/95.
23. Re: How we teach geometry by John Benson on 01/25/95.
24. Why proofs? (Sketchpad & Triangle Congruence) by Michelle Manes on 01/27/95.
25. Re: Sketchpad & Triangle Congruence by Margaret Sinclair on 01/27/95.
26. Re: Sketchpad & Triangle Congruence by Walter Whiteley on 01/27/95.
27. SsA theorem by Ronda Delcamp (Lewandowski) on 01/28/95.
28. Re: Sketchpad & Triangle Congruence by Michael Keyton on 01/31/95.
29. Dynamic verification (was Re: Sketchpad & Triangle Congruence) by James R. King on 01/31/95.

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