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We construct wonderful compactifications of the spaces of linear maps, and symmetric linear maps of a given rank as blow-ups of secant varieties of Segre and Veronese varieties. Furthermore, we investigate their birational geometry and…

Algebraic Geometry · Mathematics 2022-09-22 Alex Casarotti , Elsa Corniani , Alex Massarenti

We give a classification of absolutely dicritical foliations of cusp type, that is, the germ of singularities of complex foliations in the complex plane topologically equivalent to the singularity given by the level of the meromorphic…

Complex Variables · Mathematics 2012-03-08 Yohann Genzmer

The aim of this paper is to provide another perspective on secant varieties on algebraic curves by reformulating the problem in terms of refined de Jonqui\`eres divisors, that is divisors on the curve with prescribed multiplicities and…

Algebraic Geometry · Mathematics 2019-12-17 Mara Ungureanu

In this new version, we add the proof of the main theorem when the central fiber is not necessarily simple normal crossing. We also correct some typos.

Algebraic Geometry · Mathematics 2013-06-17 Yuchen Liu

We give examples of Fano varieties $X$ with Picard number 1, which have terminal singularities and admit endomorphisms with degree larger than 1.

Algebraic Geometry · Mathematics 2009-01-14 János Kollár , Chenyang Xu

In this paper, we present a formula for the degree of the 3-secant variety of a nonsingular projective variety embedded by a 5-very ample line bundle. The formula is provided in terms of Segre classes of the tangent bundle of a given…

Algebraic Geometry · Mathematics 2025-01-23 Doyoung Choi

In this work we study characteristic classes of possibly singular varieties embedded as a closed subvariety of a nonsingular variety. In special, we express the Schwartz-MacPherson class in terms of the $\mu$-class and Chern class of the…

Algebraic Geometry · Mathematics 2024-10-04 Antonio M. Ferreira , Fernando Lourenco

This paper has been withdrawn by the author. The statement of the Main Theorem but is wrong in general, there have been provided counterexamples. The main theorem only holds conditionally, under the finiteness statement of theorem 2.8.

Number Theory · Mathematics 2009-05-08 Peter Jossen

A projective variety $X\subset\mathbb{P}^N$ is $h$-identifiable if the generic element in its $h$-secant variety uniquely determines $h$ points on $X$. In this paper we propose an entirely new approach to study identifiability, connecting…

Algebraic Geometry · Mathematics 2019-11-05 Alex Casarotti , Massimiliano Mella

This paper has been withdrawn by the author due to a sheaf-theoretic error, in the end of the proof of the main theorem.

Algebraic Geometry · Mathematics 2008-09-23 Hugues Zuber

We give formulas for the degrees of the spaces of foliations in P2 with a dicritical singularity of prescribed order. Blowing up such singularity induces, generically, a foliation with all but finitely many leaves transversal to the…

Algebraic Geometry · Mathematics 2010-04-01 V. Ferrer , I. Vainsencher

In this paper we study singularities of third secant varieties of Veronese embedding $v_d(\mathbb{P}^n)$, which corresponds to the variety of symmetric tensors of border rank at most three in $(\mathbb{C}^{n+1})^{\otimes d}$.

Algebraic Geometry · Mathematics 2018-01-16 Kangjin Han

We consider here the problem, which is quite classical in Algebraic geometry, of studying the secant varieties of a projective variety $X$. The case we concentrate on is when $X$ is a Veronese variety, a Grassmannian or a Segre variety. Not…

We define new classes of modules of equations for secant varieties of Veronese varieties using representation theory and geometry. We also revisit some old modules of equations (catalecticant minors) to determine when they are sufficient to…

Algebraic Geometry · Mathematics 2011-12-02 J. M. Landsberg , Giorgio Ottaviani

We initiate a classification of complex polynomials f of degree d having the top Betti number of the general fibre close to the maximum. We find a range in which the polynomial must have isolated singularities and another range where it may…

Algebraic Geometry · Mathematics 2011-09-01 Dirk Siersma , Mihai Tibar

We consider the varieties $O_{k,n.d}$ of the k-osculating spaces to the Veronese varieties, the $d-$uple embeddings of $\PP n$; we study the dimension of their higher secant varieties. Via inverse systems (apolarity) and the study of…

Algebraic Geometry · Mathematics 2007-05-23 A. Bernardi , M. V. Catalisano , A. Gimigliano , M. Idà

We give a short proof that essentially all questions concerning singularities of Richardson varieties reduce to corresponding questions about Schubert varieties. Consequently, we quickly deduce some new and previously known results.

Algebraic Geometry · Mathematics 2013-12-20 Allen Knutson , Alexander Woo , Alexander Yong

We consider the quotient variety associated to a linear representation of the cyclic group of order p in characteristic p>0. We estimate the minimal discrepancy of exceptional divisors over the singular locus. In particular, we give…

Algebraic Geometry · Mathematics 2024-02-27 Takehiko Yasuda

We show how to use information about the equations defining secant varieties to smooth projective varieties in order to construct a natural collection of birational transformations. These were first constructed as flips in the case of…

Algebraic Geometry · Mathematics 2007-05-23 Peter Vermeire

We find generators for the ideals of secant varieties of Segre varieties in several the cases including the Garcia-Stillmann-Ssturmfels conjecture for four factors and prove results about their singularities.

Algebraic Geometry · Mathematics 2007-05-23 J. M. Landsberg , Jerzy Weyman