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Affine variety

Affine Variety -- from Wolfram MathWorl

An affine variety is an algebraic variety contained in affine space An affine variety is a reduced affine scheme X of finite type over a field k, i.e. X = SpecA, where A is a commutative k - algebra of finite type without nilpotent elements. The affine variety X = Speck[T1Tn], where k[T1Tn] is the ring of polynomials over k, is called affine space over k and is denoted by An k Morphisms of Affine Varieties Just as an affine variety is given by polynomials, a morphism of affine varieties is also given by polynomials. The simplest example of a morphism of two affine varieties is a polynomial map defined by, where for all

Most introductions to the topic define an affine variety as a subset of affine space that is the zero-locus of a set of polynomials. Now, X: = A ∖ {0} does not satisfy this property Affine Varieties. Definition: Let be a field and let be an affine algebraic set. Then is said to be Reducible if there exists affine algebraic sets and where and and such that . An affine algebraic set is said to be Irreducible if it is not reducible. For example consider the affine -space and let . Then if and only if or Definition. Given an affine variety, the coordinate ring of is donoted by k[V] and defined to be the set of polynomials, where. The ring k[V] is often described as the ring of polynomial functions on DECODING AFFINE VARIETY CODES 149 jNPj, with Nsufficiently high (N‚2g+1will certainly suffice) so that the only point at infinity of the embedded curve X0is the image of P.Let Idenote the ideal of the affine curve obtained by deleting the image of Pfrom X0.IfDdenotes the sum of the other F q-rational points besidesP, then C L(mP;D) is the affine variety curve C(I;L), wher 2 CHAPTER 1. AFFINE ALGEBRAIC GEOMETRY at most some fixed number d; these matrices can be thought of as the points in the n2-dimensional vector space M n(R) where all (d+ 1) ×(d+ 1) minors vanish, these minors being given by (homogeneous degree d+1) polynomials in the variables x ij, where x ij simply takes the ij-entry of the matrix. We will.

Actually, the cone and the conic section are examples of affine varieties because they are in affine space. A general variety is comprised of affine varieties glued together, like the coordinate charts of a manifold. The field of coefficients can be any algebraically closed field Notice that every affine variety is quasi-projective. Notice also that the complement of an algebraic set in an affine variety is a quasi-projective variety; in the context of affine varieties, such a quasi-projective variety is usually not called a variety but a constructible set

Affine variety - Encyclopedia of Mathematic

4. Add a comment. |. 2. You should calculate the Poincare series P X ( t) of the coordinate ring k [ X]. The the order of the pole t = 1 is exactly the dimension of the affine variete X. Some of computer algebra systems allows a Poincare series calculation for an input set of polynomials The variety corresponding to the ideal is obviously. Hence, the affine chart of will also contain the empty set, the projective closure of which is also the empty set. However, the projective closures of both and contain the point For very affine varieties satisfying a genericity condition at infinity, the result is further strengthened to relate the variety of critical points to the Chern-Schwartz-MacPherson class The term factorial for a quasiaffine variety X is used here to mean a quasiaffine variety X for which O(X) is a UFD. This is a more restrictive meaning than having all local rings be UFDs. Given a locally nilpotent derivation D on the k-algebra A,anelementa ∈ A is called a pres-lice for D if D(a) = 0= D2(a).Anelements∈ A is called a slice. Affine variety codes are a special class of error-correcting codes. They are obtained by evaluating elements of the coordinate ring of an affine variety on the \({{\Bbb F}_q}\)-rational points of that variety.In [], it was shown that every linear code over \({{\Bbb F}_q}\) can be represented as an affine variety code.Thus, the class of affine variety codes contains the whole class of linear codes

Edit: Not quite a typo at 4:45: for the V function, we have V(I n J)=V(I) u V(J). The vanishing points are unchanged if we replace V(I n J) with V(IJ), but. affine variety (plural affine varieties) (algebraic geometry) A set of points (in n-dimensional space) which satisfy a set of equations which have a polynomial of n variables on one side and a zero on the other side

A cubic plane curve given by = (+). In algebraic geometry, an affine variety, or affine algebraic variety, over an algebraically closed field k is the zero-locus in the affine space k n of some finite family of polynomials of n variables with coefficients in k that generate a prime ideal.If the condition of generating a prime ideal is removed, such a set is called an (affine) algebraic set Any variety X is endowed with the induced (Zariski) topology, whose open sets are of the form X T Ufor some open subset U An. 1.1 Coordinate Rings Since a ne varieties are de ned by polynomials over a eld, the most natural functions to consider on an a ne variety are those that come from evaluating polynomials over the base eld. 1.1.1 De nition Linear variety linear manifold, affine subspace, flat A subset M of a (linear) vector space E that is a translate of a linear subspace L of E, that is, a set M of the form x0 + L for some x0. The set M determines L uniquely, whereas x0 is defined only modulo : x0 + L = x1 + N if and only if L = N and x1 − x0 ∈ L

Stats. Asked: 2013-04-02 04:46:00 +0200 Seen: 162 times Last updated: Apr 02 '1 Affine Schubert Varieties. and the Variety of Loop Complexes. Peter Magyar. magyar@math.msu.edu. The variety of two-step loop-complexes isthe set of pairs of matrices {(X,Y) | XY = 0, YX = 0}.Using the construction of Lusztig [], we show that this varietyis isomorphic to an open subset of a Schubert variety for the loop group of GL n (C).As an application, we give an explicitBott-Samelson. For an affine variety, a regular function is a polynomial map. For an irreducible projective variety, a regular function is constant. Proof. Take . Proposition 3 Let be an irreducible variety and be two regular maps. If they agree on an open set, then they are the same. Proof Points on affine varieties (L\), produces another corresponding variety \(Res_{L/k}(X)\), defined over \(k\). It is useful for reducing questions about varieties over large fields to questions about more complicated varieties over smaller fields. This functor applied to a point gives the equivalent point on the Weil restriction of its codomain

1 A ne Varieties We will begin following Kempf's Algebraic Varieties, and eventually will do things more like in Hartshorne. We will also use various sources for commutativ Diese Bücher empfehle ich fürs Studium https://amzn.to/2z8alp6 We use the Hilbert Basis Satz to show that every affine variety X is noetherian. Was ist eigen.. An algebraic variety over kis a space with functions which is a nite union of open subspaces, each one is an a ne variety. Lemma 2. A closed subspace in an a ne variety is also a ne, and global regular functions restrict surjec- Lecture 2: Affine Varieties Author: Bezrukavnikov, Roma One can define a subset of affine space k n or an affine variety in k n to be closed if it is a subset defined by the vanishing set of finitely many polynomials in n variables with coefficients in k.The closed subsets then actually satisfy the requirements for closed sets in a topology, so this defines a topology on the affine variety known as the Zariski topology

What is a Global Regular Function on a Quasi-Affine Variety? Characterizing Affine Varieties; Translating Morphisms into Affines as k-Algebra maps; Morphisms into an Affine Correspond to k-Algebra Homomorphisms; The Coordinate Ring of an Affine Variety; Automorphisms of Affine Spaces and of Polynomial Rings - The Jacobian Conjectur Define the affine variety (a) X = V ( y − x 2, y − x + 1) . (b) Find all the rational points on X. To get rational points over Finite Field of size 5. To calculate over rational we can replace G F ( 5) by QQ but to get a finite result we have to have the intersection. But didn't get my result 1.1. AFFINE VARIETIES 3 The set of four points {(−2,−1),(−1,1),(1,−1),(1,2)}in A2 is a variety. It is the intersection of an ellipse V(x2+y2−xy−3) and a hyperbola V(3x2−y2−xy+2x+2y−3). (−1,1) (1,2) (−2,−1) (1,−1 algebraic variety. [ ‚al·jə‚brā·ik və′rī·əd·ē] (mathematics) A set of points in a vector space that satisfy each of a set of polynomial equations with coefficients in the underlying field of the vector space If we remove the point (0, 0), then we obtain a quasi-affine variety A. The ring of regular functions of A is the same as the ring of regular functions of 2 . To see this, first observe that the two varieties are clearly birational, so they have the same function field

  1. affine variety noun + gramatyka A set of points (in n-dimensional space) which satisfy a set of equations which have a polynomial of n variables on one side and a zero on the other side. tłumaczenia affine variety Dodaj . podprzestrzeń afiniczna Reta-Vortaro. rozmaitość liniow
  2. The Rational Function Field of is defined as . Elements of are called Rational Functions. The rational function field of is also sometimes called the Quotient Field of or the Field of Fractions of . Definition: Let be a field, a nonempty affine variety, and let . A rational function is Defined at if there exists polynomials with and such that
  3. Every affine variety in $\mathbb A^n$ consisting of finitely many points can be written as the zero locus of $n$ polynomial
  4. algebraic variety. The second circumstance is closely related to the first, con-sisting in the fact that varieties locally are frequently toric in structure, or toroidal. As a trivial example, a smooth variety is locally isomorphic to affine space A. Toroidal varieties are interesting in that one can transfer to them th
  5. In this video, we look at Hilbert's Nullstellensatz which makes precise, the relationship between ideals in polynomial rings and affine varieties. It follows..
  6. Legendrian Fronts for Affine Varieties. Authors: Roger Casals, Emmy Murphy. Download PDF. Abstract: In this article we study Weinstein structures endowed with a Lefschetz fibration in terms of the Legendrian front projection. First we provide a systematic recipe for translating from a Weinstein Lefschetz bifibration to a Legendrian handlebody

algebraic geometry - affine variety definition

Affine Varieties - Mathonlin

Algebraic Variety -- from Wolfram MathWorl

  1. Find link is a tool written by Edward Betts.. searching for Affine variety 22 found (94 total) alternate case: affine variety Observable subgroup (109 words) exact match in snippet view article find links to article observable subgroup of G if and only if the quotient variety G/K is a quasi-affine variety.Some basic facts about observable subgroups: Every normal algebrai
  2. AN INTRODUCTION TO AFFINE TORIC VARIETIES: EMBEDDINGS AND IDEALS JESSICA SIDMAN 1. Affine toric varieties: from lattice points to monomial mappings In this chapter we introduce toric varieties embedded in a ne space. We begin by giving embeddings and then show how to compute the ideal of an a ne toric variety from its parameterization. We.
  3. Ciphers are used in a variety of technical applications with varying degrees of complexity. The more complex the cipher, the more secure the stored value will be. The affine cipher is one of the wider-known, lesser-complex ciphers that provide a good introduction to monoalphabetic substitutions

108.22 Non-quasi-affine variety with quasi-affine normalization. The existence of an example of this kind is mentioned in [II Remark 6.6.13, EGA].They refer to the fifth volume of EGA for such an example, but the fifth volume did not appear embedding dimension, affine variety, finite system of generators. Suggest a Subject Subjects. You must be logged in to add subjects. Arithmetic rings and other special rings 13F20 Polynomial rings and ideals; rings of integer-valued polynomials Foundations 14A10 Varieties and morphisms This definition comprises two important notions: 'usual' affine Fano varieties as in Definition 1.2 when the base ${\mathcal{B}}$ is a point, and $\mathbb{A}^{1}$-cylinders when the dimension of ${\mathcal{B}}$ is positive. Recall that an $\mathbb{A}^{1}$-cylinder is a variety isomorphic to ${\mathcal{B}}\times \mathbb{A}^{1}$ for some smooth quasi-projective variety ${\mathcal{B}}$ 2. (5 pts) Let (X,Ox) and (Y, Oy) be affine varieties over K. Recall that we have constructed the affine variety XxY. Show that Oxxy(XⓇY) = Ox(x)Oy(Y).2 3. (5 pts) Let X + be a topological space. a) Show that if {U | i el} is a (finite or infinite) open cover of X, then dim X = supier dim Ui. b) Compute the dimension of V.(T? - T3, TT-TT) CA Yep! Assuming you are working over an algebraically closed field [math]K[/math], then you can identify affine [math]n[/math]-space [math]K^n[/math] with the set of [math]K[/math]-algebra homomorphisms [math]\varphi\colon K[X_1,\ldots,X_n]\to K[/ma..

Algebraic variety - Wikipedi

Viburnum rafinesquianum affine is a variety of plants with 0 observation This section is devoted to review the concept of J-affine variety classical code introduced in [] and to give some results concerning self-orthogonality with respect to the Euclidean and Hermitian inner product.As shown in [17,18,19], good examples of stabilizer codes can be obtained in this way, although, up to this paper, no general formula or bound for their distances was known The object of study is the group of units O^\ast(X) in the coordinate ring of a normal affine variety X over an algebraically closed field k. Methods of Galois cohomology are applied to those varieties that can be presented as a finite cyclic cover of a rational variety. On a cyclic cover X \rightarrow A^m of affine m-space over k such that the ramification divisor is irreducible and the. Global regular functions on affine and projective varieties. Morphisms of projective varieties do not extend to morphisms of the ambient projective spaces. Example: projection of a plane curve of degree 2 to the projective line. Monday 9/17/12. Closure of an affine variety in projective space. Examples. Open affine covering of a projective variety

Affine-variety Meaning Best 1 Definitions of Affine-variet

The maximum likelihood degree of a very affine variety - Volume 149 Issue Jun 2015. Zbigniew Jelonek. Let Xn be an affine variety of dimension n and Yn be a quasi-projective variety of the same dimension. We prove that for a quasi-finite polynomial mapping f : Xn → Yn. In the present chapter we will give a new point of view on evaluation codes by introducing them instead as particular nice examples of affine variety codes. Our study includes a reformulation of the usual methods to estimate the minimum distances of evaluation codes into the setting of affine variety codes Affine Algebraic Geometry. The present volume grew out of an international conference on affine algebraic geometry held in Osaka, Japan during 3-6 March 2011 and is dedicated to Professor Masayoshi Miyanishi on the occasion of his 70th birthday. It contains 16 refereed articles in the areas of affine algebraic geometry, commutative algebra.

ag.algebraic geometry - Dimension of affine variety ..

  1. Abstract. We show that sheet closures appear as associated varieties of affine vertex algebras. Further, we give new examples of non-admissible affine vertex algebras whose associated variety is contained in the nilpotent cone. We also prove some conjectures from our previous paper and give new examples of lisse affine W -algebras
  2. Borel fixed point theorem: suppose G is a connected solvable affine group and it acts on a complete variety X. Then it has a fixed point. Then it has a fixed point. Lie-Kolchin theorem : suppose G is a connected solvable closed subgroup of GL n (k); then for some x in GL n (k) we have xGx -1 ⊂ the set of upper-triangular matrixes
  3. Let V be an affine variety over a field k and let R=k[V] be its coordinate ring. Let d_{t}(R) denote the transcendence degree of the field of fractions k(V) o
  4. T1 - On affine variety codes from the Klein quartic. AU - Geil, Hans Olav. AU - Ozbudak, Ferruh. PY - 2019/3/15. Y1 - 2019/3/15. N2 - We study a family of primary affine variety codes defined from the Klein quartic. The duals of these codes have previously been treated in Kolluru et al., (Appl. Algebra Engrg. Comm. Comput. 10(6):433-464, 2000.
  5. affine algebraic in a sentence 1) Thus it is an affine algebraic variety. affine collocations 2) An irreducible affine algebraic set is also called an affine variety. 3) Affine varieties can be given a natural topology by declaring the closed sets to be precisely the affine algebraic sets. affine algebraic example sentences 4) The general linear group GLn is an affine algebraic variety.
  6. Then, is an affine variety and . Let and be two distinct points in , then there is a regular function on such that . Lift to , we find a regular function on such that and is not a constant. Theorem 9. An irreducible quasiprojective variety is an affine variety if and only if and for all , , where is any hypersurface with sufficiently large degree
  7. We prove that the automorphism group $\text{Aut}(X)$ of a rigid affine variety contains a unique maximal torus $\mathbb{T}$. If the grading on the algebra of regular functions $\mathbb{K}[X]$ defined by the action of $\mathbb{T}$ is pointed, the group $\text{Aut}(X)$ is a finite extension of $\mathbb{T}$..

CHAPTER 1. AFFINE ALGEBRAIC VARIETIES 3 2) If (W ) is a family of subsets of An, then I(S W ) = T I(W ). 3) If W 1 W 2, then I(W 2) I(W 1). Proof. All assertions follow immediately from de nition. We have thus set up two maps between subsets of Anand ideals in Rand we are in-terested in the two compositions Spec-- make an affine variety . Spec R-- create an affine variety or scheme from the ring R

Projective Closures of Affine Varieties - Fruits of

There are two categorical realizations of the affine Hecke algebra: constructible sheaves on the affine flag variety and coherent sheaves on the Langlands dual Steinberg variety. A fundamental problem in geometric representation theory is to relate these two categories by a category equivalence. This was achieved by Bezrukavnikov in characteristic 0 about a decade ago Structures of Affine Varieties. The following article is a brief summary of the first chapter of Mumford's coverage of classical algebraic geometry that I have been reading the past month. We cover affine algebraic varieties, focusing on the case of . This has an advantage of simplifying some proofs and allowing the analytical/topological. Retrieved from https://commalg.subwiki.org/w/index.php?title=Affine_variety&oldid=2

Here is one way: for a generic choice of coordinates, for an affine variety of dimension n with N coordinates, you can delete any set of N-n of the coordinates, and the resulting projection map is a proper finite-to-one map to C n.. Then, properness of the finite-to-one map implies that compactness of the variety is equivalent to compactness of C n.. In short, that an affine n dimensional. 16 CHAPTER 2. BASICS OF AFFINE GEOMETRY For example, the standard frame in R3 has origin O =(0,0,0) and the basis of three vectors e 1 =(1,0,0), e 2 =(0,1,0), and e 3 =(0,0,1). The position of a point x is then defined by the unique vector from O to x. But wait a minute, this definition seems to be definin This latter variety (or species) is more tall and stout than Equisetum hyemale affine, and the teeth of its sheaths are supposed to be more persistent. The Scouring Rush can be distinguished from other horsetails ( Equisetum spp. ) in the state by its large size, rough unbranched stems, and pointed cones Title /usr/local/bin/dvialw Affine Author: Aaron Bertram : Created Date: 19103012614050 But beware that 2x3 affine transformations cant be multiplied this way, you'll first have to extend them to 3x3 matrices by adding a 0 0 1 row at bottom. After that you compute C = BA if you want to perform A before B or C = AB if you want to perform B first. - Micka Oct 28 '16 at 13:35

VM can interact with a large variety of attack surfaces. Ex-ploiting a software fault in any of these surfaces leads to full access to all other VMs that are co-located on the same host. Hence, the efficient detection of hypervisor vulnerabilities is crucial for the security of the modern cloud infrastructure T1 - On affine variety codes from the Klein quartic. AU - Geil, Hans Olav. AU - Ozbudak, Ferruh. PY - 2019/3/15. Y1 - 2019/3/15. N2 - We study a family of primary affine variety codes defined from the Klein quartic. The duals of these codes have previously been treated in Kolluru et al., (Appl. Algebra Engrg. Comm. Comput. 10(6):433-464, 2000. Affine Follow Offering capabilities across the continuum of the analytical value chain, we assist over 40 Fortune-500 global enterprises across the USA, UK, Europe, Singapore and India Affine flag variety parametrizing an algebraic family and realizing F as an ind-group 3. Preliminaries on moduli space of G-bundles and the determinant bundle 4. A result on algebraic descent 5. Identification of the determinant bundle 6. Statement of the main theorem and its proo

Our team at Affine has been delivering a new age gaming experience with a variety of breakthroughs such as making use of customized maps unique to each gamer, forming different team combinations based on the skill level of the players, and assisting game designers in the development of new game characters in real-time among others Adj. 1. affinal - (anthropology) related by marriage. affine. anthropology - the social science that studies the origins and social relationships of human beings. related - connected by kinship, common origin, or marriage - Pieri rule for the affine flag variety, Advances in Mathematics, 304 (2017), 266-284. - (with A. Barvinok and I. Novik) Explicit constructions of centrally symme tric k-neighborly polytopes and large strictly antipodal sets

1 February 2019 Legendrian fronts for affine varieties. Roger Casals, Emmy Murphy. Duke Math. J. 168(2): 225-323 (1 February 2019). DOI: 10.1215/00127094-2018-0055. ABOUT FIRST PAGE CITED BY REFERENCES DOWNLOAD PAPER SAVE TO MY LIBRARY. Pezzini and Van Steirteghem have recently obtained a combinatorial characterization of the weight monoids of smooth affine spherical varieties, using the combinatorial theory of spherical varieties and a smoothness criterion due to R. Camus. The first part of this thesis gives an implementation in Sage of a special case of this combinatorial. Abstract We introduce the problem of constructing explicit variety evasive subspace families. Given a family ℱ of subvarieties of a projective or affine space, a collection ℋ of projective or affine k-subspaces is (ℱ,ε)-evasive if for every ∈ ℱ, all but at most ε-fraction of W ∈ ℋ intersect every irreducible component of with (at most) the expected dimension

Scouring Rush Horsetail (Equisetum hyemale 'varImage German violet (Exacum trinervium 'Kandy') - 559003ANSP Diatom New Taxon File

d;V is a projective variety, so let us begin by giving an embedding into some projective space. Recall that the exterior algebra of V, V (V), is the quotient of the tensor algebra T(V) by the ideal generated by all elements of the form v v, where v2V. Multiplication in this algebra (the so called wedge product) is alternating, that is, v 1 ^^ v. Assuming a certain purity conjecture, we derive a formula for the (complex) cohomology groups of the affine Springer fiber corresponding to any unramified regular semisimple element. We use this calculation to present a complex analog of the fundamental lemma for function fields. We show that the kappa orbital integral that arises in the fundamental lemma is equal to the Lefschetz trace of. Noun []. algebraic variety (plural algebraic varieties) (algebraic geometry) The set of solutions of a given system of polynomial equations over the real or complex numbers; any of certain generalisations of such a set that preserve the geometric intuition implicit in the original definition.2005, Giovanni Giachetta, Luigi Mangiarotti, Gennadi Sardanashvili, Geometric and Algebraic Topological. Our model1can animate a variety of objects, surpassing previous methods by a large margin on existing benchmarks. The first column is ground truth video, the second corresponds to No pca or bg model baseline (when affine transformations are predicted, no background modeling is used), the third column is the No pca baseline (when affine.

The maximum likelihood degree of a very affine variety

Synonyms for affine in Free Thesaurus. Antonyms for affine. 1 synonym for affine: affinal. What are synonyms for affine Representation theory seminar 2021 semester 1 Representation theory seminar 2021, Semester 1. Organisers: Kari Vilonen, Ting Xue, Yaping Yang. Topics: Affine Lie algebras, Kazhdan-Lusztig conjectures, localisation Time: Tuesdays 3:15pm-5pm. 15 June 2:15pm Arun Ram (Melbourne) Representations of affine Hecke algebras IV: Where do Hecke algebras come from?.

Affine simplex synonyms, Affine simplex pronunciation, Affine simplex translation, English dictionary definition of Affine simplex. adj. 1. Consisting of or marked by only one part or element. 2 Abstract The present paper studies the connection between the category of modules over the affine Kac-Moody Lie algebra at the critical level, and the category of D-modules on the affine flag scheme \(G((t))/I\), where \(I\) is the Iwahori subgroup

Affine Variety Codes over a Hyperelliptic Curve SpringerLin

The Affine cipher is a type of monoalphabetic substitution cipher, wherein each letter in an alphabet is mapped to its numeric equivalent and then encrypted using a simple mathematical function. It inherits the weaknesses of all substitution ciphers. A simple Caesar shift is a type of affine cipher, wherein each letter is enciphered with the function , where is the magnitude of the shift. 1. Breaking an Affine Cipher. In an affine cipher, the letters of the original message are first identified with integer values (A=0, B=1, C=2, D=3, Z=25). These values are then used as inputs to a function of the following form (assuming an alphabet of 26 letters): As an example, suppose we wished to encrypt the plaintext message HELLO with. significant optimization tool owing to its capability in solving variety of optimization problems with fast convergence speed even for large number of parameters tuning [21]-[25]. Next, the proposed data-based Piecewise Affine PI controller design is verified to a widely established model of buck-converter generated DC motor [1]

Convex cone, Affine connection, Affine variety Cône convexe : En algèbre linéaire, un cône convexe est un sous-ensemble d'un espace vectoriel sur un champ ordonné qui est fermé sous des combinaisons linéaires à coefficients positifs 9:30 am: Conference Opening by SPUR faculty advisors Prof. David Jerison and Prof. Ankur Moitra 9:35 am: Dain Kim and Anqi Li, Cubic Goldreich-Levin (mentor: Jonathan Tidor) 10:05 am: Preston Cranford and Peter Rowley, Finding bounded simplicial sets with finite homology (mentor: Robert Burklund) 10:45 am: Enrico Colon, Split-multiplicity-free flagged Schur polynomials.

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