Geometry, a subject with which we are all familiar from high school, investigates properties of figures, i.e., sets of points in the plane or in space.1 The question arises, which properties of figures are of interest to the geometer? To answer this question, we can use two different approaches. Both lead to the same conclusions. Both will be of use to us in what follows, and so deserve our attention.
KeywordsSmoke Clarification Coord
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