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Poinsot's spirals

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This is an old revision of this page, as edited by 190.1.10.179 (talk) at 18:10, 16 May 2010 (Well, couldn't see the equations, so I edited it and now it can be seen. But I'm not familiarized with this topic, so someone who does should give it a view, and correct it if necessary.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

The Poinsot spiral r=csch(θ/3).
The Poinsot spiral r=sech(θ/3).

In mathematics, Poinsot's spirals are two spirals represented by the polar equations

where csch is the hyperbolic cosecant, and sech is the hyperbolic secant.