would this help?:http://www.proofwiki.org/wiki/Catenary#Proof

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This page here gives the differential equation for the all the conic sections, yours is on the bottom. The differential equation can used to derive the curve as the focus of the parabola rides on the x axis, it will be found to be a catenary. This derivation is a proof.

]]>I read that too and it is cited in at least 4 spots:

http://www.centralillinoiswoodturners.c … 20Form.pdf

http://www.pballew.net/arithme8.html#catenary

http://www.npr.org/templates/story/stor … Id=6434007

http://www-groups.dcs.st-and.ac.uk/~his … enary.html

I have been unable to find that proof.

According to this page,

http://webcache.googleusercontent.com/s … =firefox-a

Maxwell is the discoverer of the proof you are looking for!

Check this out!

]]>If you roll a parabola along the x-axis, the focus of the rolling parabola traces out a catenary. I read this a number of places, but I've yet been able to find, or create, a proof.

Can anyone help? Please?

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