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POINTS IN EUCLIDEAN GEOMETRY A point in are not Parallel , there is exactly one point that lies on both of them. Euclid sometimes implicitly assumed facts that did not follow from the axioms (for example about the ordering of points on lines, and occasionally about the existence of points distinct from a finite list of points). Therefore the traditional Axiomatization of ''point'' was not entirely complete and definitive. POINTS IN CARTESIAN GEOMETRY Intuitively one can understand a location in the Cartesian 3D space. This location could be described with three Real Number Coordinates : for instance P But one can also describe points in 1, 2 or more than 3 dimensions. The description of a point is quite similar to the description of a spatial Vector , which also can exist in space with dimensions from one to many. The conceptual difference between these notions is significant, though: a point indicates a location, while a vector indicates a direction and length. If a distinguished point (the '' Origin '') is given, one can describe a location by giving the direction and distance from the origin to that point. One could argue that in this world it makes no sense to say that a point is in a one or two dimensional space, because we experience space in 3 dimensions, where one or two dimensions exists within this space, thus forcing 1d and 2d points to actually be 3d points. This way one could say that the only real ''spatial points'' are 3d points. And one could also argue that by giving more than 3 coordinates one starts to describe features which are not related to space (how would you describe the fourth dimension in Spatial terms?) This is really a question about what we mean by ''space''. POINTS IN TOPOLOGY In Topology , a point is simply an element of the underlying set of a Topological Space . Similar usage holds for similar structures such as Uniform Space s, Metric Space s, and so on. |
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