Orchid XP v8 wrote:
> By complete coincidence, I spent my afternoon today reading about magmas
> and groups and rings and quasigroups and semigroups and groupoids and
> rings and skew rings and splitting fields and fields of factors and
> polynomial rings and that whole zoo of other things... Apparently
> "vector field" doesn't mean what you'd expect at all! :-D

And I've yet to figure out how to solve t out of

(X0 + Xd * t - Xc)^2 + (Y0 + Yd * t - Yc)^2 + (Z0 + Zd * t - Zc)^2 = Sr^2

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