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Similarly, the [[surface]] of a [[sphere]] is 2-dimensional, since one requires 2 independent parameters to specify the location of a point on the surface: the [[latitude]] and [[longitude]].

Similarly, the [[surface]] of a [[sphere]] is 2-dimensional, since one requires 2 independent parameters to specify the location of a point on the surface: the [[latitude]] and [[longitude]].

There are other, more elaborate, definitions of dimension, that measure geometric objects like fractal lines, that would have an infinite 1-dimensional length but a zero 2-dimensional area. Fractals have dimensions that are not integer numbers. Fractals don't exist in nature, but some natural objects behave, approximately, like fractals: a broccoli, a costline or the surface of the human brain are examples of natural objects that look like fractals.

There are other, more elaborate, definitions of dimension, that measure geometric objects like [[fractal]] lines, that would have an infinite 1-dimensional length but a zero 2-dimensional area. Fractals have dimensions that are not integer numbers. Fractals don't exist in nature, but some natural objects behave, approximately, like fractals: a broccoli, a costline or the surface of the human brain are examples of natural objects that look like fractals.

==Other mathematical definitions==

==Other mathematical definitions==