Madalina Roxana Buneci

@utgjiu.ro

University Constantin Brancusi from Targu-Jiu



                    

https://researchid.co/mbuneci
5

Scopus Publications

241

Scholar Citations

7

Scholar h-index

8

Scholar i10-index

Scopus Publications

  • A second countable locally compact transitive groupoid without open range map
    Mădălina Buneci
    American Mathematical Society (AMS)
    Dana P. Williams raised in [Proc. Amer. Math. Soc., Ser. B 3 (2016), pp. 1–8] the following question: Must a second countable, locally compact, transitive groupoid have open range map? This paper gives a negative answer to that question. Although a second countable, locally compact transitive groupoid G G may fail to have open range map, we prove that we can replace its topology with a topology which is also second countable, locally compact, and with respect to which G G is a topological groupoid whose range map is open. Moreover, the two topologies generate the same Borel structure and coincide on the fibres of G G .

  • A urysohn type lemma for groupoid


  • Mean square stability of discrete-time fractional order systems with multiplicative noise
    Viorica Mariela Ungureanu and Mădălina Roxana Buneci
    Springer International Publishing

  • Topological groupoids with locally compact fibres


  • Morphisms of discrete dynamical systems
    Mădălina Roxana Buneci and
    American Institute of Mathematical Sciences (AIMS)
    The purpose of this paper is to introduce a category whose objects are discrete dynamical systems $( X,P,H,\\theta ) $ in the sense of [6] and whose arrows will be defined starting from the notion of groupoid morphism given in [10]. We shall also construct a contravariant functor $( X,P,H,\\theta ) \\rightarrow $C* $( X,P,H,\\theta ) $ from the subcategory of discrete dynamical systems for which $PP^{-1}$ is amenable to the category of C* -algebras, where C* $( X,P,H,\\theta ) $ is the C* -algebra associated to the groupoid $G( X,P,H,\\theta)$.

  • A generalization of zakrzewski morphisms


  • Isomorphic groupoid C*-algebras associated with different Haar systems


  • Morphisms which are continuous on a neighborhood of the base of a groupoid
    M. Buneci
    Akademiai Kiado Zrt.
    Kirill Mackenzie raised in [3] (p. 31) the following question: given a morphism F : Ω → Ω′, where Ω and Ω′ are topological groupoids and F is continuous on a neighborhood of the base in Ω, is it true that is Ω continuous everywhere?This paper gives a negative answer to that question. Moreover, we shall prove that for a locally compact groupoid Ω with non-singleton orbits and having open target projection, if we assume that the continuity of every morphism F on a neighborhood of the base in Ω implies the continuity of F everywhere, then the groupoid Ω must be locally transitive.

RECENT SCHOLAR PUBLICATIONS

  • FUZZIFICATION AND DEFUZZIFICATION OF IRREVERSIBLE DYNAMICS THROUGH ALGEBRAIC STRUCTURES.
    MR Buneci
    Annals of'Constantin Brancusi'University of Targu-Jiu. Engineering Series 2024

  • RANDOMLY GENERATED FUZZY DISCRETE DYNAMICAL SYSTEMS.
    MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 33 (1) 2024

  • VISUALIZATION TOOLS FOR FUZZY DISCRETE DYNAMICAL SYSTEMS.
    IC BĂRBĂCIORU, MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 33 (1) 2024

  • FUZZY GROUPOIDS VERSUS LEFT INVARIANT FUZZY EQUIVALENCE RELATIONS.
    MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 2023

  • Fuzzification and defuzzification of actions in the groupoids framework
    M Buneci
    Annals of the “Constantin Brncuși” University of Trgu-Jiu. Engineering 2023

  • GENERALIZED ACTIONS–A NEW WAY TO THINK OF GROUPOID MORPHISMS.
    MR Buneci
    Annals of'Constantin Brancusi'University of Targu-Jiu. Engineering Series 2022

  • VISUALIZATION TOOLS FOR GROUPOIDS ASSOCIATED TO NONAUTONOMOUS DISCRETE DYNAMICAL SYSTEMS.
    MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 2022

  • USING SDV TO OBTAIN RELEVANT REDUCTIONS OF SUBGROUPOIDS OF XxZxX.
    MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 27 (1) 2021

  • A NOTE ON NONAUTONOMOUS DISCRETE SYSTEMS IN TERMS OF GROUPOIDS.
    MR Buneci
    Annals of'Constantin Brancusi'University of Targu-Jiu. Engineering Series 2021

  • Fuzzy groupoid morphisms and actions
    M Buneci
    Annals of the “Constantin Brncuși” University of Trgu-Jiu. Engineering 2020

  • GROUPOID MORPHISMS IN TERMS OF ACTIONS.
    MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 2020

  • A second countable locally compact transitive groupoid without open range map
    M Buneci
    Proceedings of the American Mathematical Society 147 (8), 3603-3610 2019

  • INTUITIONISTIC FUZZY GROUPOIDS AND ACTIONS
    MR Buneci
    Annals of Constantin Brncuşi University of Trgu-Jiu. Engineering Series 2019

  • MAPLE PROCEDURES FOR ANALYZING THE ACCURACY OF THE APPROXIMATE DEVELOPMENTS OBTAINED USING GORE METHOD.
    MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 2019

  • Unifying various fuzzy structures using Brandt groupoids
    M Buneci
    Fiability & Durability/Fiabilitate si Durabilitate 2018

  • A FEW REMARKS ON LOCALLY COMPACT TOPOLOGIES AND HAAR SYSTEMS.
    MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 2018

  • FUZZY ACTIONS AS FUZZY GROUPOIDS
    MR Buneci
    Annals of Constantin Brncuşi University of Trgu-Jiu - Engineering Series 2018

  • Approximations for uniformly continuous functions on groupoids
    MR Buneci
    Surveys in Mathematics and its Applications 12, 219-227 2017

  • MAPLE PROCEDURES FOR ERROR ESTIMATION OF APPROXIMATE DEVELOPMENTS OBTAINED USING HORIZONTAL ZONES.
    MR Buneci
    Annals of Constantin Brncuşi University of Trgu-Jiu - Engineering Series 2017

  • A GROUPOID FRAMEWORK FOR STUDY ASYMPTOTIC BEHAVIOR OF A DISCRETE SYSTEM
    MR BUNECI
    Fiability & Durability/Fiabilitate si Durabilitate 2017

MOST CITED SCHOLAR PUBLICATIONS

  • Morphisms of locally compact groupoids endowed with Haar systems
    MR Buneci, P Stachura
    arXiv preprint math/0511613 2005
    Citations: 31

  • Groupoid C* algebras
    MR Buneci
    Math. Appl 1, 71-98 2006
    Citations: 28

  • Reprezentari de grupoizi (Groupoid Representations)
    MR Buneci
    Editura Mirton Timisoara 2003
    Citations: 23

  • Haar systems and homomorphism on groupoids
    MR Buneci
    Operator Algebras and Mathematical Physics (Constantza, 2001), Editors J.-M 2003
    Citations: 23

  • Groupoid categories
    MR Buneci
    Perspectives in Operator Algebras and Mathematical Physics. Theta Ser. Adv 2008
    Citations: 22

  • USING MAPLE TO REPRESENT THE SUBGROUPOIDS OF TRIVIAL GROUPOID X Z X.
    MR BUNECI
    Fiability & Durability/Fiabilitate Si Durabilitate 2013
    Citations: 14

  • Consequences of Hahn structure theorem for the Haar measure
    M Buneci
    Math. Rep.(Bucur.) 4 (54), 321-334 2002
    Citations: 14

  • Metode numerice, aspecte teoretice şi practice
    MR Buneci
    Editura Academica Brncuşi, Trgu-Jiu 2009
    Citations: 12

  • Groupoid reductions associated to discrete dynamical systems
    MR Buneci
    Annals of the “Constantin Brncuşi” University of Trgu-Jiu. Engineering 2012
    Citations: 11

  • Morphisms of discrete dynamical systems
    MR Buneci
    Discrete and Continuous Dynamical Systems 29 (1), 91-107 2010
    Citations: 11

  • The structure of the Haar systems on locally compact groupoids
    M Buneci
    Math. Phys. Electron. J 8 (4), 1-11 2002
    Citations: 11

  • Isomorphic groupoid C*-algebras associated with different Haar systems
    MR Buneci
    New York Journal of Mathematics 11, 225-245 2005
    Citations: 10

  • Convolution algebras for topological groupoids with locally compact fibres
    MR Buneci
    Opuscula Mathematica 31 (2), 159-172 2011
    Citations: 9

  • Groupoid algebras for transitive groupoids
    MR Buneci
    Math. Rep.(Bucur.) 5 (55), 9-26 2003
    Citations: 9

  • C*-algebras associated to the transitive groupoids
    M Buneci
    An. Univ. Craiova Ser. Mat. Inform 28, 79-92 2001
    Citations: 9

  • Unifying various fuzzy structures using Brandt groupoids
    M Buneci
    Fiability & Durability/Fiabilitate si Durabilitate 2018
    Citations: 8

  • The equality of the reduced and the full C*-algebras and the amenability of a topological groupoid
    MR Buneci
    Recent Advances in Operator Theory, Operator Algebras, and their 2005
    Citations: 7

  • VARIOUS NOTIONS OF AMENABILITY FOR NOT NECESSARILY LOCALLY COMPACT GROUPOIDS
    MR Buneci
    Surveys in Mathematics and its Applications 2014
    Citations: 6

  • Amenable unitary representations of measured groupoids
    MR Buneci
    Revue Roumaine de Mathematiques Pures et Appliquees 48 (2), 129-134 2003
    Citations: 6

  • A Urysohn type lemma for groupoids
    MR Buneci
    Theory and Applications of Categories 32 (28), 970-994 2017
    Citations: 5