Main Concept

Toroidal coordinates are defined by three parameters: the radius $r$, and two angles: $\mathrm{\θ}$ (around a circle in the $x\,y$-plane) and $\mathrm{\φ}$ (around the $z$-axis).

$r$$$:

$\mathrm{\θ}$$$:

$\mathrm{\φ}$$$:

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