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In finite geometry, PG(3, 2) is the smallest three-dimensional projective space. It can be thought of as an extension of the Fano plane. It has 15 points, 35 lines, and 15 planes. [1] It also has the following properties: [2] Each point is contained in 7 lines and 7 planes. Each line is contained in 3 planes and contains 3 points.
The smallest 2-dimensional projective geometry (that with the fewest points) is the Fano plane, which has 3 points on every line, with 7 points and 7 lines in all, ...
Because they satisfy a quadratic constraint, they establish a one-to-one correspondence between the 4-dimensional space of lines in and points on a quadric in (projective 5-space). A predecessor and special case of Grassmann coordinates (which describe k -dimensional linear subspaces, or flats , in an n -dimensional Euclidean ...
The Fano plane can be extended in a third dimension to form a three-dimensional projective space, denoted by PG(3, 2). It has 15 points, 35 lines, and 15 planes and is the smallest three-dimensional projective space. [16] It also has the following properties: [17] Each point is contained in 7 lines and 7 planes.
The field planes are usually denoted by PG(2, q) where PG stands for projective geometry, the "2" is the dimension and q is called the order of the plane (it is one less than the number of points on any line). The Fano plane, discussed below, is denoted by PG(2, 2). The third example above is the projective plane PG(2, 3). The Fano plane.
In mathematics, projective geometry is the study of geometric properties that are invariant with respect to projective transformations. This means that, compared to elementary Euclidean geometry, projective geometry has a different setting (projective space) and a selective set of basic geometric
Projective geometry; ... principles of descriptive geometry and is a two-dimensional representation of a three-dimensional object. It is a parallel projection (the ...
The infinite real projective space is constructed as the direct limit or union of the finite projective spaces: :=. This space is classifying space of O (1) , the first orthogonal group . The double cover of this space is the infinite sphere S ∞ {\displaystyle S^{\infty }} , which is contractible.
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