PlanetMath:

I added the pic. The reason I'm taking so long, is that I got my internet access cut out , so I don't login to planetmath daily. I saw the catenary addition, I'm working on that one now. If need to change anything abot the tractrix, please describe it to me as precisely as you can in a real email to pdsanchez@gmail.com and I'll mail back the files

diff	2005-06-11 10:46:54 - revision [ Version 16 --> Version 17 ] by drini

diff	2005-06-07 10:37:42 - revision [ Version 15 --> Version 16 ] by pahio

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2005-06-02 16:35:12 - revision [ Version 14 --> Version 15 ] by pahio

Added the evolute.

diff	2005-06-02 10:26:14 - revision [ Version 13 --> Version 14 ] by pahio

diff	2005-05-31 07:04:50 - revision [ Version 12 --> Version 13 ] by pahio

diff	2005-05-31 07:00:56 - revision [ Version 11 --> Version 12 ] by pahio

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2005-05-25 16:36:10 - revision [ Version 10 --> Version 11 ] by pahio

The second parametric presentation fixed.

diff	2005-05-25 16:02:41 - revision [ Version 9 --> Version 10 ] by pahio

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2005-05-24 17:33:22 - revision [ Version 8 --> Version 9 ] by pahio

Added ortogonal curves.

diff	2005-05-24 17:16:20 - revision [ Version 7 --> Version 8 ] by pahio

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2005-05-24 17:10:43 - revision [ Version 6 --> Version 7 ] by pahio

Fixed the sign errors.

diff	2005-05-24 12:05:52 - revision [ Version 5 --> Version 6 ] by pahio

diff	2005-05-24 07:55:15 - revision [ Version 4 --> Version 5 ] by pahio

diff	2005-05-24 05:34:00 - revision [ Version 3 --> Version 4 ] by pahio

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