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...e zero dimensions, since there are no degrees of freedom within it, and no coordinates are necessary to specify a point within it (since it only comprises one poi ...trochilical]], [[phalaggomatic coordinates|phalaggomatic]], and [[glomeric coordinates]], and so on. In each dimension, more exotic coordinate systems also exist

...the ''z''-coordinate can be expressed as a function of the ''x'' and ''y''-coordinates), then the area of the surface is equal to <math>\iint {\sqrt { \left ( \fr