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-column proofs by
**Bob Hayden**on 01/23/95. - Re: Two-column proofs by
**John Conway**on 01/24/95. - Re: Two-column proofs by
**Lou Talman**on 01/24/95. - Re: Two-column proofs by
**Judy Roitman**on 01/24/95. - Re: Two-column proofs by
**Heidi Burgiel**on 01/24/95. - Re: Two-Column Proofs by
**Mark Saul**on 01/24/95. - Re: Two-column proofs by
**John Conway**on 01/24/95. - Re: Two-column proofs by
**John Conway**on 01/24/95. - Re: Two-Column Proof by
**John Conway**on 01/24/95. - Re: Two-column proofs by
**Walter Whiteley**on 01/24/95. - Re: Two-column proofs by
**Pat Ballew**on 01/25/95. - Re: Two-column proofs by
**Dave Wilson**on 01/25/95. - 2-col. proofs by
**Bob Hayden**on 01/25/95. - Formal Proofs in Geometry by
**Walter Whiteley**on 01/25/95. - 2-column proof example by
**Annie Fetter**on 01/25/95. - Re: 2-col. proofs by
**John Conway**on 01/25/95. - Re: Two-Column Proof by
**W Gary Martin**on 01/25/95. - Re: Two-column proofs by
**Lou Talman**on 01/25/95. - Re: 2-col. proofs by
**Michael Keyton**on 01/25/95. - Re: 2-col. proofs by
**John Conway**on 01/26/95. - Re: Two-column proofs by
**Michelle Manes**on 01/27/95. - Re: Two-column proofs by
**Andrei TOOM**on 01/27/95. - Re: Two-column proofs by
**Lou Talman**on 01/27/95. - Re: Two-column proofs by
**W Gary Martin**on 01/27/95. - Re: Two-column proofs by
**Andrei TOOM**on 01/27/95. - 2 column proofs by
**Ronda Delcamp (Lewandowski)**on 01/28/95. - Re: 2 column proofs by
**B. Overkamp**on 01/28/95. - Still two column proofs by
**John Benson**on 01/28/95. - Re: 2 column proofs by
**Scott Smith**on 01/28/95. - Re: 2 column proofs by
**Andrei Toom**on 01/29/95. - Re: Two-column proofs by
**John Conway**on 01/29/95. - Re: 2-col. proof by
**John Conway**on 01/29/95. - Re: 2 column proofs by
**John Conway**on 01/29/95. - Re: Two-column proofs by
**R. D. Foster**on 01/29/95. - Re: 2 column proofs by
**Dan Hirschhorn**on 01/30/95. - Re: Still two column proofs by
**Robin Mc Leod**on 01/30/95. - Re: Still two column proofs by
**John Conway**on 01/30/95. - Not quite two column proofs by
**Judy Roitman**on 01/30/95. - Re: 2 column proofs by
**W Gary Martin**on 01/30/95. - Re: 2-col. proofs by
**Bob Hayden**on 01/30/95. - Re: 2 column proofs by
**Gary Tupper**on 01/30/95. - Re: 2 column proofs by
**Walter Whiteley**on 01/31/95. - Re: 2 column proofs by
**John Conway**on 01/31/95. - Re: 2 column proofs by
**Walter Whiteley**on 01/31/95. - Proof in High school by
**John Benson**on 01/31/95.

- Sketchpad & Triangle Congruence by
**Ben Preddy**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**Heidi Burgiel**on 01/22/95. - Re: Sketchpad & Triangle Congruence by
**Art Mabbott**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**Art Mabbott**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**Ronald S. Tiberio**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**John Conway**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**Judy Roitman**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**William T. Webber**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**Lou Talman**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**J. Evans**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**Walter Whiteley**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**Art Mabbott**on 01/23/95. - Re: Sketchpad & Triangle Congruence by
**Doris Schattschneider**on 01/23/95. - How we teach geometry by
**Bob Hayden**on 01/23/95. - High School Proof by
**Rex Boggs**on 01/24/95. - Re: How we teach geometry by
**John Conway**on 01/24/95. - Re: Sketchpad & Triangle Congruence by
**Dan Hirschhorn**on 01/24/95. - Re: Sketchpad & Triangle Congruence by
**Margaret Sinclair**on 01/24/95. - Re: Sketchpad & Triangle Congruence by
**Annie Fetter**on 01/24/95. - Re: Sketchpad & Triangle Congruence by
**John Conway**on 01/24/95. - Re: Sketchpad & Triangle Congruence by
**John Conway**on 01/24/95. - Re: Sketchpad & Triangle Congruence by
**John Conway**on 01/24/95. - Re: How we teach geometry by
**John Benson**on 01/25/95. - Why proofs? (Sketchpad & Triangle Congruence) by
**Michelle Manes**on 01/27/95. - Re: Sketchpad & Triangle Congruence by
**Margaret Sinclair**on 01/27/95. - Re: Sketchpad & Triangle Congruence by
**Walter Whiteley**on 01/27/95. - SsA theorem by
**Ronda Delcamp (Lewandowski)**on 01/28/95. - Re: Sketchpad & Triangle Congruence by
**Michael Keyton**on 01/31/95. - Dynamic verification (was Re: Sketchpad & Triangle Congruence) by
**James R. King**on 01/31/95.

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6 July 1995