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Displaying 941 – 960 of 1144

On the p-rank of an abelian variety and its endomorphism algebra.

Josep González (1998)

Publicacions Matemàtiques

Let A be an abelian variety defined over a finite field. In this paper, we discuss the relationship between the p-rank of A, r(A), and its endomorphism algebra, End0(A). As is well known, End0(A) determines r(A) when A is an elliptic curve. We show that, under some conditions, the value of r(A) and the structure of End0(A) are related. For example, if the center of End0(A) is an abelian extension of Q, then A is ordinary if and only if End0(A) is a commutative field. Nevertheless, we give an example...

On the preservation of k-very ampleness under adjunction.

Mauro C. Beltrametti, A.J. Sommenese (1993)

Mathematische Zeitschrift

On the prime-to- $p$ part of the groups of connected components of Néron models

Bas Edixhoven (1995)

Compositio Mathematica

On the principal bundles over a flag manifold.

Azad, Hassan, Biswas, Indranil (2004)

Journal of Lie Theory

On the principle of real moduli flexibility: perfect parametrizations

Edoardo Ballico, Riccardo Ghiloni (2014)

Annales Polonici Mathematici

Let V be a real algebraic manifold of positive dimension. The aim of this paper is to show that, for every integer b (arbitrarily large), there exists a trivial Nash family $= {V_{y}}_{y \in R^{b}}$ of real algebraic manifolds such that V₀ = V, is an algebraic family of real algebraic manifolds over $y \in R^{b} ∖ 0$ (possibly singular over y = 0) and is perfectly parametrized by $R^{b}$ in the sense that $V_{y}$ is birationally nonisomorphic to $V_{z}$ for every $y, z \in R^{b}$ with y ≠ z. A similar result continues to hold if V is a singular real algebraic set.

On the problem of detecting linear dependence for products of abelian varieties and tori

Antonella Perucca (2010)

Acta Arithmetica

On the projective normality of complete linear series on an algebraic curve.

Robert Lazarsfeld, Mark Green (1986)

Inventiones mathematicae

On the projective normality of the adjunction bundles.

Andrew J. Sommese, M. Andreatta (1991)

Commentarii mathematici Helvetici

On the projectivity of the moduli spaces of curves.

M.D.T. Cornalba (1993)

Journal für die reine und angewandte Mathematik

On the purity of the branch locus

Allen Altman, Steven L. Kleiman (1971)

Compositio Mathematica

On the Pythagoras number of a real irreducible algebroid curve.

Jesus J. Ortega (1991)

Mathematische Annalen

On the Pythagoras numbers of real analytic set germs

José F. Fernando, Jesús M. Ruiz (2005)

Bulletin de la Société Mathématique de France

We show that (i) the Pythagoras number of a real analytic set germ is the supremum of the Pythagoras numbers of the curve germs it contains, and (ii) every real analytic curve germ is contained in a real analytic surface germ with the same Pythagoras number (or Pythagoras number $2$ if the curve is Pythagorean). This gives new examples and counterexamples concerning sums of squares and positive semidefinite analytic function germs.

Currently displaying 941 – 960 of 1144

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Displaying 941 – 960 of 1144

On the p-rank of an abelian variety and its endomorphism algebra.

On the preservation of k-very ampleness under adjunction.

On the prime-to- $p$ part of the groups of connected components of Néron models

On the principal bundles over a flag manifold.

On the principle of real moduli flexibility: perfect parametrizations

On the problem of detecting linear dependence for products of abelian varieties and tori

On the projective normality of complete linear series on an algebraic curve.

On the projective normality of the adjunction bundles.

On the projectivity of the moduli spaces of curves.

On the purity of the branch locus

On the Pythagoras number of a real irreducible algebroid curve.

On the Pythagoras numbers of real analytic set germs

On the pythagoras numbers of real analytic surfaces

On the quantum cohomology of the plane, old and new, and a K3 analogue.

On the Ramification of Branched Coverings of IPn.

On the Rational Points of Abelian Varieties over Zp Extensions of Number Fields.

On the Rationality of Certain Generating Functions.

On the rationality of certain strata of the Lange stratification of stable vector bundles on curves.

On the rationality of periods of primitive forms

On the rationality of the moduli schemes of vector bundles on curves

Currently displaying 941 – 960 of 1144