Примеры использования Algebraic curve на Английском языке и их переводы на Русский язык
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Both are algebraic curves of degree 2.
The concept of a focus can be generalized to arbitrary algebraic curves.
The statement for algebraic curves can be proved using Serre duality.
The analogue of a Riemann surface is a non-singular algebraic curve C over a field k.
An algebraic curve over C likewise has topological dimension two; in other words, it is a surface.
The equation x2+ y2+ 1 0 defines an algebraic curve, whose real part is empty.
The existence of the tangent half-angle formulae stems from the fact that the circle is an algebraic curve of genus 0.
The bicorn is a plane algebraic curve of degree four and genus zero.
However, more complex areas are developing in mathematics,for example, algebraic curves over finite fields.
It was later generalized to algebraic curves, to higher-dimensional varieties and beyond.
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.
For example, the unit circle is a real algebraic curve, being the set of zeros of the polynomial x2+ y2- 1.
For an algebraic curve, a non singular point is an inflection point if and only if the multiplicity of the intersection of the tangent line and the curve(at the point of tangency) is odd and greater than 2.
The compactness of a Riemann surface is paralleled by the condition that the algebraic curve be complete, which is equivalent to being projective.
An irreducible plane algebraic curve of degree d has(d- 1)(d- 2)/2- g singularities, when properly counted.
They are also referred to as Hurwitz curves, interpreting them as complex algebraic curves complex dimension 1 real dimension 2.
More generally, one may consider algebraic curves that are not contained in the plane, but in a space of higher dimension.
At the time it was considered surprising, and it spurred Grothendieck todevelop his theory of dessins d'enfant, which describes nonsingular algebraic curves over the algebraic numbers using combinatorial data.
In this case the theorem states that an algebraic curve of degree n intersects a given line in n points, counting the multiplicities.
The cruciform curve is related by a standard quadratic transformation, x↦ 1/x, y↦ 1/y to the ellipse a2x2+ b2y2 1, andis therefore a rational plane algebraic curve of genus zero.
This example provides the template for studying general algebraic curves near non-singular points, the algebraic curve in this case being the real line.
On an algebraic curve(i.e. a one-dimensional variety V) over a finite field, we say that a rational function on an open affine subset U is defined as the ratio of two polynomials in the affine coordinate ring of U, and that a rational function on all of V consists of such local data which agree on the intersections of open affines.
Because compact Riemann surfaces are synonymous with non-singular complex projective algebraic curves, a Hurwitz surface can also be called a Hurwitz curve. .
Every irreducible complex algebraic curve is birational to a unique smooth projective curve, so the theory for curves is trivial.
The general approach of diophantine geometry is illustrated by Faltings's theorem(a conjectureof L. J. Mordell) stating that an algebraic curve C of genus g> 1 over the rational numbers has only finitely many rational points.
It is known that Nagata's conjecture on algebraic curves is equivalent to the assertion that for more than nine general points, the Seshadri constants of the projective plane are maximal.
Lines in this plane correspond to points in the dual projective plane andthe lines tangent to a given algebraic curve C correspond to points in an algebraic curve C* called the dual curve. .
Determining an algebraic curve through a set of points consists of determining values for these coefficients in the algebraic equation such that each of the points satisfies the equation.
Thus, writing ℓ(D) for the dimension(over k) of the space of rational functions on the curve whose poles at every point are not worse than the corresponding coefficient in D, the very same formula as above holds: ℓ( D)- ℓ( K- D) deg( D)- g+ 1.{\displaystyle\ell(D)-\ell( K-D)=\ deg( D) -g+1.}where C is a projective non-singular algebraic curve over an algebraically closed field k.
Just one example:he taught us how useful it can be to study an algebraic curve in the real plane by considering the complex version in the complex plane, which then becomes a complex curve, or in other words, a surface….