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Curve

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In topology, a curve is a one-dimensional continuum (Charatonik and Prajs 2001).

In analytic geometry, a curve is continuous map from a one-dimensional space to an n-dimensional space. Loosely speaking, the word "curve" is often used to mean the function graph of a two- or three-dimensional curve. The simplest curves can be represented parametrically in n-dimensional space as

x_1=f_1(t)
(1)
x_2=f_2(t)
(2)
|
(3)
x_n=f_n(t).
(4)

Other simple curves can be simply defined only implicitly, i.e., in the form

 f(x_1,x_2,...)=0.
(5)

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