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In this paper we address the problem of classifying complex (non-homogeneous) quasihomogeneous polynomials in two variables under bi-Lipschitz equivalence. We prove that pairs of such polynomials are (right) bi-Lipschitz equivalent as…

Complex Variables · Mathematics 2025-03-05 Leonardo Câmara , Alexandre Fernandes

The main goal of this work is to show that if two weighted homogeneous (but not homogeneous) function-germs $(\C^2,0)\to(\C,0)$ are bi-Lipschitz equivalent, in the sense that these function-germs can be included in a strongly bi-Lipschitz…

Algebraic Geometry · Mathematics 2011-02-24 Alexandre Fernandes , Maria Ruas

Two blow-analytically equivalent real analytic plane function germs are sub-analytically bi-Lipschitz contact equivalent

Algebraic Geometry · Mathematics 2016-01-26 Lev Birbrair , Alexandre Fernandes , Terence Gaffney , Vincent Grandjean

We construct an invariant of the bi-Lipschitz contact equivalence of continuous function germs definable in a polynomially bounded o-minimal structure, such as semialgebraic functions. For a germ $f,$ the invariant is given in terms of the…

Algebraic Geometry · Mathematics 2019-01-16 Tien-Son Pham , Nguyen Thao Nguyen Bui

In this paper we study Lipschitz contact equivalence of continuous function germs in the plane definable in a polynomially bounded o-minimal structure, such as semialgebraic and subanalytic functions. We partition the germ of the plane at…

Algebraic Geometry · Mathematics 2014-07-11 Lev Birbrair , Alexandre Fernandes , Andrei Gabrielov , Vincent Grandjean

We introduce two different notions of infinitesimal bi-Lipschitz equivalence for functions, one related to bi-Lipschitz triviality of families of functions, one related to homeomorphisms which are bi-Lipschitz on the fibers of the functions…

Complex Variables · Mathematics 2016-01-21 Terence Gaffney

We study the classification problem of singularities of function-germs with harmonic leading terms of two variables under the right-equivalence. We observe that the multiple actions of Laplacian appear for the classifications of such class…

Differential Geometry · Mathematics 2016-11-01 Yuki Yasuda

In this paper, we study Multi-$\mathcal{K}$-equivalence of multi-germs of functions on the plane, definable in a polynomially bounded o-minimal structure. We partition the germ of the plane at origin into zones of arcs in such a way that it…

Algebraic Geometry · Mathematics 2023-04-14 Lev Birbrair , Rodrigo Mendes

We give conditions for topological and bi-Lipschitz equivalences within a class of mixed singularities of Pham-Brieskorn type. As a consequence, we construct infinite families that are topologically trivial but have distinct bi-Lipschitz…

Algebraic Geometry · Mathematics 2026-05-05 Inácio Rabelo

In this paper we investigate the relation betwen the Nash modification and the Bi-Lipschtiz equivalent germs in the cases of two germs and for a family of hypersurfaces with isolated singularities.

Algebraic Geometry · Mathematics 2012-07-31 J. -P. Brasselet , A. Fernandes , N. G. Grulha , M. A. S. Ruas

Consider real-analytic mapping-germs, (R^n,o)-> (R^m,o). They can be equivalent (by coordinate changes) complex-analytically, but not real-analytically. However, if the transformation of complex-equivalence is identity modulo higher order…

Algebraic Geometry · Mathematics 2026-04-29 Dmitry Kerner

We study the classification problem of singularities of function-germs with harmonic leading terms of two variables under the right-equivalence. We study the classification in the cases that the order of function-germs is at most 7.…

Differential Geometry · Mathematics 2015-11-24 Yuki Yasuda

Let $P^{k}(n,p) $ be the set of all real polynomial map germs $f = ( f_1 , ..., f_p ) : (\mathbb{R}^{n},0) \rightarrow (\mathbb{R}^{p},0)$ with degree of $f_1 , ...,f_p$ less than or equal to $ k \in \mathbb{N}$. The main result of this…

Algebraic Geometry · Mathematics 2017-06-27 Lev Birbrair , Joao Costa , Rodrigo Mendes , Edvalter Sena

We investigate the classification of quasihomogeneous polynomials in two variables with real coefficients under semialgebraic bi-Lipschitz equivalence in a neighborhood of the origin in ${\mathbb R}^2$. Building on the work of Birbrair,…

Algebraic Geometry · Mathematics 2025-03-11 Sergio Alvarez

Lipschitz equivalence of self-similar sets is an important area in the study of fractal geometry. It is known that two dust-like self-similar sets with the same contraction ratios are always Lipschitz equivalent. However, when self-similar…

Metric Geometry · Mathematics 2012-07-31 Huo-Jun Ruan , Yang Wang , Li-Feng Xi

We study the properties of the a complete invariant of the analytic function of two variables with respect to the Lipschitz contact equivalence. This invariant is called pizza. We prove that the pizza of real analytic functions has some…

Metric Geometry · Mathematics 2018-01-19 Lev Birbrair , Rodrigo Mendes

We show that two analytic function germs $(\C^2,0) \to (\C,0)$ are topologically right equivalent if and only if there is a one-to-one correspondence between the irreducible components of their zero sets that preserves the multiplicites of…

Algebraic Geometry · Mathematics 2008-04-28 Adam Parusinski

In this paper, we study the question of classifying self-similar sets under bi-Lipschitz mappings and obtain an important bi-Lipschitz invariant, which is an ideal of a ring related to IFS. Roughly speaking, different Lipschitz equivalence…

Metric Geometry · Mathematics 2013-04-19 Li-Feng Xi , Ying Xiong

We provide bi-Lipschitz invariants for finitely determined map germs $f: (\mathbb{K}^n,0) \to (\mathbb{K}^p, 0)$, where $\mathbb{K} = \mathbb{R}$ or $ \mathbb{C}$. The aim of the paper is to provide partial answers to the following…

Geometric Topology · Mathematics 2025-09-23 Jean-paul Brasselet , Maria Aparecida Soares Ruas , Thuy Nguyen

This paper is devoted to the study of the relative Lipschitz saturation of complex algebraic varieties. More precisely, we investigate the concept of Lipschitz saturation of a variety in another, and we focus on the case where the dominant…

Algebraic Geometry · Mathematics 2024-06-26 François Bernard
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