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

\( r = a\ \operatorname{csch} (n\theta) \)
\( r = a\ \operatorname{sech} (n\theta) \)

where csch is the hyperbolic cosecant, and sech is the hyperbolic secant.[1] They are named after the French mathematician Louis Poinsot.

See also

Cotes's spiral


Lawrence, J. Dennis (1972). A Catalog of Special Plane Curves. New York: Dover. pp. 192–194. ISBN 0486602885.

Undergraduate Texts in Mathematics

Graduate Texts in Mathematics

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Mathematics Encyclopedia

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