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Introduction To Euclid
Introduction To Euclid

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... satisfies |F ∩ X| ≥ |X| contains at least one point of Y . The difference between this notion and that of a (strong) -net considered in the previous subsection is that here Y does not have to necessarily be a subset of X. Indeed, this makes the task of finding a small net much easier, and unlike t ...
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... 1. Points that lie on the same line. _______________________ 2. To divide a figure into two equal parts. _________________________ 3. To have the same measure. _____________________ 4. Endpoint of two rays that form an angle. ____________________ 5. Two rays that intersect to form a line. __________ ...
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Duality (projective geometry)

In geometry a striking feature of projective planes is the symmetry of the roles played by points and lines in the definitions and theorems, and (plane) duality is the formalization of this concept. There are two approaches to the subject of duality, one through language (§ Principle of Duality) and the other a more functional approach through special mappings. These are completely equivalent and either treatment has as its starting point the axiomatic version of the geometries under consideration. In the functional approach there is a map between related geometries that is called a duality. Such a map can be constructed in many ways. The concept of plane duality readily extends to space duality and beyond that to duality in any finite-dimensional projective geometry.
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