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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_

...gical meaning, and in spectrology it is almost always pluralized [[regular inflection|regularly]]&mdash;although the plural "eidola" is very occasionally seen. ...iring doesn't mean it doesn't happen&mdash;and in fact some spectrologists point to the Juventude Paradox itself as such evidence, although the existence of