Marcin Bilski
Jagiellonian University
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Featured researches published by Marcin Bilski.
Indagationes Mathematicae | 2009
Marcin Bilski
Abstract Let X be an analytic subset of pure dimension n of an open set U ⊂ Cm and let E be a Nash subset of U such that E ⊂ X.Then for every a ∈ E there is an open neighborhood V of a in U and a sequence {Xv} of complex Nash subsets of V of pure dimension n converging to X ∩ V in the sense of holomorphic chains such that the following hold for every v ∈ N: E ∩ V ⊂ Xv and the multiplicity of Xv at x equals the multiplicity of X at x for every x in a dense open subset of E ⊂ V.
Journal of Mathematical Analysis and Applications | 2015
Janusz Adamus; Marcin Bilski
Abstract We prove that every complex analytic set X in a Runge domain Ω can be approximated by Nash sets on any relatively compact subdomain Ω 0 of Ω. Moreover, for every Nash subset Y of Ω with Y ⊂ X , the approximating sets can be chosen so that they contain Y ∩ Ω 0 . As a consequence, we derive a necessary and sufficient condition for a complex analytic set X to admit a Nash approximation which coincides with X along its arbitrary given subset.
Journal of The London Mathematical Society-second Series | 2014
Marcin Bilski; Adam Parusinski
The aim of this paper is to give an analytic proof of the theorem on algebraic approximations of holomorphic maps from Runge domains to affine algebraic varieties.
Journal of Pure and Applied Algebra | 2001
Marcin Bilski
Abstract We analyze the problem of generative complexity for varieties of semigroups. We focus our attention on varieties generated by a finite semigroup. A variety is said to have polynomial generative complexity if and only, if the number of k -generated semigroups it contains is bounded from above by a polynomial in k . We fully characterize the class of finite semigroups which generate varieties with polynomial complexity. It turns out that only semigroups of very special shape have this property. These are semigroups with zero multiplication or semigroups which are the product of a left-zero semigroup, a right-zero semigroup and an Abelian group. Moreover a characterization of finite semigroups generating varieties with linear complexity is given.
Mathematische Zeitschrift | 2018
Marcin Bilski; Krzysztof Kurdyka; Adam Parusinski; Guillaume Rond
It is known that every germ of an analytic set is homeomorphic to the germ of an algebraic set. In this paper we show that the homeomorphism can be chosen in such a way that the analytic and algebraic germs are tangent with any prescribed order of tangency. Moreover, the space of arcs contained in the algebraic germ approximates the space of arcs contained in the analytic one, in the sense that they are identical up to a prescribed truncation order.
Mathematische Zeitschrift | 2013
Marcin Bilski; Wojciech Kucharz; Anna Valette; Guillaume Valette
Constructive Approximation | 2012
Marcin Bilski
Comptes Rendus Mathematique | 2005
Marcin Bilski
Journal of Algebraic Geometry | 2016
Marcin Bilski; Adam Parusinski; Guillaume Rond
Mathematische Zeitschrift | 2007
Marcin Bilski