Re: Dual-theta math

Terence wrote:
I think Rick means an (R, Theta, Phi) 3-D coordinate system.
Ed Beroset calles the R "rho", which being Greek is usually reserved
for an angle (in my school days), but this may be a cultural
difference.

Generally, I'd also use Greek letters for angles, too, but in the specific case of spherical coordinates, in my experience it's common to specify the radius with rho. Could indeed be a cultural difference.

One coordinate at least has to have dimensions of length,
so R gets it as a radius vector.

Yes, that's the intent, no matter which letter we use.

Ed

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