Examples of using Projective space in English and their translations into Russian
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Models of projective plane and projective space.
Its closure in projective space is the rational normal curve.
Axioms of projective plane and projective space.
In the paper 4 the projective space on the basis of concept of orthogonal circles is modeled and the basic properties of bundle of circles are summarized.
The Gale transform is an involution on sets of points in projective space.
In contrast, the analytic approach is to define projective space based on linear algebra and utilizing homogeneous co-ordinates.
Let C P 1{\displaystyle\mathbb{CP}^{1}} be the Riemann sphere:1-dimensional complex projective space.
An example is the infinite-dimensional complex projective space, with sequence 1, 0, 1, 0, 1,… that is periodic, with period length 2.
Fano varieties can be considered the algebraic varieties which are most similar to projective space.
In a projective space, PG(3, K), a correlation is given by: points in homogeneous coordinates(a, b, c, d)↔ planes with equations ax+ by+ cz+ dw 0.
More narrowly, a Galois geometry may be defined as a projective space over a finite field.
These included frequent use of birational models in dimension three of surfaces that can have non-singular models only when embedded in higher-dimensional projective space.
This is a measure of the complexity of a variety, with projective space having Kodaira dimension-∞.
In general, operations on a rational curve(or surface)are equivalent to operations on a nonrational curve in a projective space.
However, any variety that admits one embedding into projective space admits many others by composing the embedding with the Veronese embedding.
By Chow's theorem,no complex torus other than the abelian varieties can'fit' into projective space.
In 1883 he published a dissertation on quadrics in projective space and was named as assistant to professors in algebra and analytic geometry.
Those who are interested exclusively by the circles geometry can omit all connected with projective space.
At the other extreme, the birational automorphism group of projective space Pn over a field k, known as the Cremona group Crn(k), is large(in a sense, infinite-dimensional) for n≥ 2.
The Euler sequence is a particular exact sequence of sheaves on n-dimensional projective space over a ring.
It is an algebraic surface in three-dimensional projective space defined by a single quaternary cubic polynomial which is homogeneous of degree 3 hence, cubic.
The Fano plane can be extended in a third dimension to form a three-dimensional projective space, denoted by PG3,2.
Recall that a vector field on an open set U of the projective space P( V){\displaystyle\mathbb{P}(V)} can be defined as a derivation of the functions defined on this open set.
In the special case where X is projective over k,this is proved by reducing to the case of line bundles on projective space, discussed above.
For example, the equivalence between algebraic andanalytic coherent sheaves on projective space implies Chow's theorem that every closed analytic subspace of CPn is algebraic.
Brill-Noether theory went further by estimating the dimension of the space of maps of given degree d from an algebraic curve to projective space Pn.
That is, in a projective space of dimension n, the points(dimension 0) correspond to hyperplanes(codimension 1), the lines joining two points(dimension 1) correspond to the intersection of two hyperplanes(codimension 2), and so on.
Therefore, the space of quartic curves can be identified with the real projective space R P 14{\displaystyle\mathbb{RP}^{14.
In order to avoid these issues, a sophisticated theory of handling a linear system of divisors was developed in effect,a line bundle theory for hyperplane sections of putative embeddings in projective space.
The most delicate part of Bézout's theorem andits generalization to the case of k algebraic hypersurfaces in k-dimensional projective space is the procedure of assigning the proper intersection multiplicities.