Talk:Desargues' theorem

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Mathematics rating: Start Class Mid Priority  Field: Geometry

Great god.... even esoteric subject get a fine treatment. Thanks to whoever contributed to this article. Xah Lee

[edit] adding dynamic geometry program files

btw, there's this great free software:

Compass and Ruler is written in Java by von R Grothmann. This program is excellent. It is very well written, in Java and available for Mac or Windows or Linux, and it is free with source code too. Its home page is at http://mathsrv.ku-eichstaett.de/MGF/homes/grothmann/java/zirkel/index.html

that we can use and build example files to go along with article and theorems. Xah Lee 15:36, 2005 Mar 18 (UTC)


I don't understand from the proof... I can't see the equivalence with those scalar & cross products.

[edit] application in perspective drawing

There is a nice practical application in perspective drawing: suppose you have two (or more) lines drawn in perspective, which meet at a vanishing point located far enough away from the physical page to be constructed directly. Desargues' theorem can be used to construct additional lines which meet at the same vanishing point. --Heath 69.174.67.197 05:04, 16 July 2006 (UTC)

[edit] Suggested merger from Perspective (geometry)

I needed a link for perspective triangles recently and was forced to resort to MathWorld instead, as the Perspective (geometry) article hadn't yet been created. I would prefer not to merge, as I think that perspective triangles are important enough, that there are enough results about them that are distinct from Desargues' theorem, and that there are enough other topics already included in the Desargues theorem article that it would be confusing to link to it under the perspective triangle name. —David Eppstein (talk) 04:55, 28 December 2007 (UTC)

Specifically, what results about perspective triangles other than Desargues' theorem do you have in mind? Michael Hardy (talk) 22:11, 5 January 2008 (UTC)
A better question might be: Specifically what other relations of Desargues' theorem to concepts in mathematics do you have in mind other than perspective triangles? The theorem should be merged into the definition if anything. Nousernameslefttalk and matrix? 02:45, 13 January 2008 (UTC)
Since this hasn't any opposition for quite a while, I'll just remove the template. Nousernameslefttalk and matrix? 18:44, 5 January 2008 (UTC)