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- ...eans that a sphere is a [[degeneracy|degenerate case]] of a [[torus]].) A point can be considered a degenerate sphere with a radius of [[zero]]; the [[empt ...ctangular coordinate]]s, the [[equation]] of a sphere with a center at the point <math>(x_0, y_0, z_0)</math> and a radius of ''r'' is <math>(x-x_0)^2+(y-y_11 KB (1,809 words) - 00:49, 1 June 2015
- ...gical meaning, and in spectrology it is almost always pluralized [[regular inflection|regularly]]—although the plural "eidola" is very occasionally seen. ...iring doesn't mean it doesn't happen—and in fact some spectrologists point to the Juventude Paradox itself as such evidence, although the existence of19 KB (2,956 words) - 02:10, 3 September 2023