Now showing items 21-35 of 35

    • On the geometry of strongly flat semigroups and their generalizations 

      László T.; Némethi A. (2018-09-18)
      Our goal is to convince the readers that the theory of complex normal surface singularities can be a powerful tool in the study of numerical semigroups, and, in the same time, a very rich source of interesting affine and ...
    • On Zariski’s multiplicity problem at infinity 

      Sampaio J. E. (Proceedings of the American Mathematical Society, 2018-08-14)
      We address a metric version of Zariski's multiplicity conjecture at infinity that says that two complex algebraic affine sets which are bi-Lipschitz homeomorphic at infinity must have the same degree. More specifically, ...
    • A proof of the differentiable invariance of the multiplicity using spherical blowing-up 

      Sampaio J. E. (Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas, 2018-04-21)
      In this paper we use some properties of spherical blowing-up to give an alternative and more geometric proof of Gau-Lipman Theorem about the differentiable invariance of the multiplicity of complex analytic sets. Moreover, ...
    • A proof of the integral identity conjecture, II 

      Thuong L.Q. (Comptes Rendus Mathematique, 2017-10-31)
      In this note, using Cluckers-Loeser’s theory of motivic integration, we prove the integral identity conjecture with framework a localized Grothendieck ring of varieties over an arbitrary base field of characteristic zero.
    • Representation of surface homeomorphisms by tête-à-tête graphs 

      Fernández de Bobadilla J.; Pe Pereira M.; Portilla Cuadrado P. (2017-06-21)
      We use tête-à-tête graphs as defined by N. A'campo and extended versions to codify all periodic mapping classes of an orientable surface with non-empty boundary, improving work of N. A'Campo and C. Graf. We also introduce ...
    • Right unimodal and bimodal singularities in positive characteristic 

      Nguyen H.D. (International Mathematics Research Notices, 2017-08-07)
      The problem of classification of real and complex singularities was initiated by Arnol'd in the sixties who classified simple, unimodal and bimodal singularities w.r.t. right equivalence. The classification of simple ...
    • Semialgebraic CMC surfaces in $\mathbb{R}^3$ with singularities 

      Sampaio J. E. (2018-06-30)
      In this paper we present a classification of a class of semialgebraic CMC surfaces in $\mathbb{R}^3$ that generalizes the recent classification made by Barbosa and do Carmo in 2016 (complete reference is in the paper), we ...
    • A Short Survey on the Integral Identity Conjecture and Theories of Motivic Integration 

      Thuong L.Q. (Acta Mathematica Vietnamica, 2017-04-04)
      In Kontsevich-Soibelman’s theory of motivic Donaldson-Thomas invariants for 3-dimensional noncommutative Calabi-Yau varieties, the integral identity conjecture plays a crucial role as it involves the existence of these ...
    • A Short Survey on the Integral Identity Conjectureand Theories of Motivic Integration 

      Thuong L.Q. (Acta Mathematica Vietnamica, 2016-12-16)
      In Kontsevich-Soibelman’s theory of motivic Donaldson-Thomas invariants for 3-dimensional noncommutative Calabi-Yau varieties, the integral identity conjecture plays a crucial role as it involves the existence of these ...
    • Singularities in Geometry and Topology 

      Romano A. (2018-06-18)
      This thesis consists of two different topics that are not related. The thesis has two different and independent parts that can be read in any order. The purpose of this work is to study two topics in singularity theory: ...
    • Singularities of the Hilbert scheme of effective divisors 

      Dan A. (2017-01-10)
      In this article, we study the Hilbert scheme of effective divisors in smooth hypersurfaces in $\mathbb{P}^3$, a topic not extensively studied. We prove that there exists such effective divisors $D$ satisfying the property: ...
    • Some classes of homeomorphisms that preserve multiplicity and tangent cones 

      Sampaio J. E. (2018-08-19)
      In this paper it is presented some classes of homeomorphisms that preserve multiplicity and tangent cones of complex analytic sets. Moreover, we present a class of homeomorphisms that has the multiplicity as an invariant ...
    • A specialization property of index 

      Dan A.; Kaur I. (2017-01-10)
      In [Kol13] Kollár defined $i$-th index of a proper scheme over a field. In this note we study how index behaves under specialization, in any characteristic.
    • Surgery formulae for the Seiberg-Witten invariant of plumbed 3-manifolds 

      László T.; Nagy J.; Némethi A. (2017-02)
      Assume that $M(\mathcal{T})$ is a rational homology sphere plumbed 3--manifold associated with a connected negative definite graph $\mathcal{T}$. We consider the combinatorial multivariable Poincar\'e series associated ...
    • Topology of Spaces of Valuations and Geometry of Singularities 

      de Felipe Ana B. (Transactions of the AMS - American Mathematical Society, 2017-11-11)
      Given an algebraic variety X defined over an algebraically closed field, we study the space RZ(X,x) consisting of all the valuations of the function field of X which are centered in a closed point x of X. We concentrate ...