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In mathematics, a conchospiral is a three-dimensional spiral. In cylindrical coordinates, it is described by the parametric equations:

\( r=\mu^t a \)
\( \theta=t \)
\( z=\mu^t c \).

The projection of a conchospiral on the (r, θ)-plane is a logarithmic spiral.
External links

Weisstein, Eric W., "Concho-Spiral", MathWorld.

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