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The fundamental unit used in building problem domains is the geometric POINT. POINTS in a FlexPDE script are expressed as a parenthesized list of coordinate values, as in the two dimensional point (2.4, 3.72).  


Since two- and three- dimensional domain definitions both begin with a two-dimensional layout, the use for three-dimensional points is generally limited to ELEVATION PLOTS.


In one-dimensional systems, a POINT degenerates to a single parenthesized coordinate, such as (2.4).