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Finite geometry information


Finite affine plane of order 2, containing 4 "points" and 6 "lines". Lines of the same color are "parallel". The centre of the figure is not a "point" of this affine plane, hence the two green "lines" don't "intersect".

A finite geometry is any geometric system that has only a finite number of points. The familiar Euclidean geometry is not finite, because a Euclidean line contains infinitely many points. A geometry based on the graphics displayed on a computer screen, where the pixels are considered to be the points, would be a finite geometry. While there are many systems that could be called finite geometries, attention is mostly paid to the finite projective and affine spaces because of their regularity and simplicity. Other significant types of finite geometry are finite Möbius or inversive planes and Laguerre planes, which are examples of a general type called Benz planes, and their higher-dimensional analogs such as higher finite inversive geometries.

Finite geometries may be constructed via linear algebra, starting from vector spaces over a finite field; the affine and projective planes so constructed are called Galois geometries. Finite geometries can also be defined purely axiomatically. Most common finite geometries are Galois geometries, since any finite projective space of dimension three or greater is isomorphic to a projective space over a finite field (that is, the projectivization of a vector space over a finite field). However, dimension two has affine and projective planes that are not isomorphic to Galois geometries, namely the non-Desarguesian planes. Similar results hold for other kinds of finite geometries.

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Finite geometry

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A finite geometry is any geometric system that has only a finite number of points. The familiar Euclidean geometry is not finite, because a Euclidean line...

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Finite field

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algebraic geometry, Galois theory, finite geometry, cryptography and coding theory. A finite field is a finite set that is a field; this means that...

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Discrete geometry

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methods of discrete geometric objects. Most questions in discrete geometry involve finite or discrete sets of basic geometric objects, such as points, lines...

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Combinatorics

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Finite geometry is the study of geometric systems having only a finite number of points. Structures analogous to those found in continuous geometries...

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Affine geometry

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In mathematics, affine geometry is what remains of Euclidean geometry when ignoring (mathematicians often say "forgetting") the metric notions of distance...

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Incidence geometry

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Combinatorial designs Finite geometry Intersection theorem Levi graph As, for example, L. Storme does in his chapter on Finite Geometry in Colbourn & Dinitz...

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Projective geometry

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synthetic geometry. Another topic that developed from axiomatic studies of projective geometry is finite geometry. The topic of projective geometry is itself...

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Incidence matrix

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important example is a finite geometry. For instance, in a finite plane, X is the set of points and Y is the set of lines. In a finite geometry of higher dimension...

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Geometry

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concept of angle and distance, finite geometry that omits continuity, and others. This enlargement of the scope of geometry led to a change of meaning of...

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Projective space

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synthetic geometry. Another topic that developed from axiomatic studies of projective geometry is finite geometry. The topic of projective geometry is itself...

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Outline of geometry

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Distance geometry Elliptic geometry Enumerative geometry Epipolar geometry Finite geometry Fractal geometry Geometry of numbers Hyperbolic geometry Incidence...

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Arithmetic geometry

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study of schemes of finite type over the spectrum of the ring of integers. The classical objects of interest in arithmetic geometry are rational points:...

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Algebraic combinatorics

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Galois geometries. Finite geometries can also be defined purely axiomatically. Most common finite geometries are Galois geometries, since any finite projective...

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Riemannian geometry

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Riemannian geometry is the branch of differential geometry that studies Riemannian manifolds, defined as smooth manifolds with a Riemannian metric (an...

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Finite mathematics

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of Finite Mathematics, Academic Press Business mathematics § Undergraduate Discrete mathematics Finite geometry Finite group, Finite ring, Finite field...

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Fano plane

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In finite geometry, the Fano plane (after Gino Fano) is a finite projective plane with the smallest possible number of points and lines: 7 points and...

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Galois geometry

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Galois geometry (so named after the 19th-century French mathematician Évariste Galois) is the branch of finite geometry that is concerned with algebraic...

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Shape of the universe

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to both its local and global geometry. Local geometry is defined primarily by its curvature, while the global geometry is characterised by its topology...

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Combinatorics of Finite Geometries

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Combinatorics of Finite Geometries is an undergraduate mathematics textbook on finite geometry by Lynn Batten. It was published by Cambridge University...

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Algebraic geometry

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different and algebraic geometry includes also geometry in finite characteristic. Algebraic geometry now finds applications in statistics, control theory...

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Geometrization conjecture

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3-manifolds with finite fundamental group. Examples include the 3-sphere, the Poincaré homology sphere, Lens spaces. This geometry can be modeled as...

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Oval

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quadrilaterals. Retrieved 21 October 2020. Dembowski, Peter (1968), Finite geometries, Ergebnisse der Mathematik und ihrer Grenzgebiete, Band 44, Berlin...

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Foundations of geometry

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Foundations of geometry is the study of geometries as axiomatic systems. There are several sets of axioms which give rise to Euclidean geometry or to non-Euclidean...

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Discrete mathematics

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can be finite or infinite. The term finite mathematics is sometimes applied to parts of the field of discrete mathematics that deals with finite sets,...

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History of geometry

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as well as over the real or complex numbers. Finite geometry itself, the study of spaces with only finitely many points, found applications in coding theory...

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Projective plane

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called the Fano plane. See also the article on finite geometry. Using the vector space construction with finite fields there exists a projective plane of order...

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Synthetic geometry

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geometry is no more in use, except at elementary level, or for geometries that are not related to any sort of numbers, such as some finite geometries...

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