| Definition: | set of points of a three-dimensional point space, the position vector of which is a continuous function f of the pairs of real numbers u and v in some region U r=f(u,v) where (u,v)∈U⊆R2 Note 1 to entry: A surface can also be generated by a family of curves dependent on one parameter or, in a three-dimensional space, be defined algebraically by the equation f(x,y,z)=0.
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