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See detailThe discrete Pompeiu problem on the plane
Kiss, Gergely UL

Presentation (2018, November 27)

The discrete Pompeiu problem is stemmed from an integral-geometric question on the plane. The problem is whether we can reconstruct a function if we know the average values of the function on every ... [more ▼]

The discrete Pompeiu problem is stemmed from an integral-geometric question on the plane. The problem is whether we can reconstruct a function if we know the average values of the function on every congruent copy of a given pattern. After introducing the theory of spectral analysis on discrete Abelian groups, I show some results for the discrete version of the problem. One of the arguments is connected to a coloring problem of the plane. One of them is a geometric construction and some others based on some geometric and combinatoric properties of the plane. I also mention some unsolved questions of the topic. My talk is based on a joint work with M. Laczkovich and Cs. Vincze. [less ▲]

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See detailRecent results on conservative and symmetric n-ary semigroups
Kiss, Gergely UL; Devillet, Jimmy UL; Marichal, Jean-Luc UL

Scientific Conference (2017, June 16)

See attached file

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See detailGeneralization of Czoga\l a-Drewniak Theorem for $n$-ary semigroups
Kiss, Gergely UL; Somlai, Gabor

in Torra, Vicenç; Mesiar, Radko; De Baets, Bernard (Eds.) Aggregation Functions in Theory and in Practice (2017)

We investigate n-ary semigroups as a natural generalization of binary semigroups. We refer it as a pair (X,F_n), where X is a set and an n-associative function F_n : X^n -> X is defined on X. We show that ... [more ▼]

We investigate n-ary semigroups as a natural generalization of binary semigroups. We refer it as a pair (X,F_n), where X is a set and an n-associative function F_n : X^n -> X is defined on X. We show that if F_n is idempotent, n-associative function which is monotone in each of its variables, defined on an interval I and has a neutral element, then F_n is combination of the minimum and maximum operation. Moreover we can characterize the n-ary semigroups (I,F_n) where F_n has the previous properties. [less ▲]

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See detailA characterization of n-associative, monotone, idempotent functions on an interval that have neutral elements
Kiss, Gergely UL; Somlai, Gabor

in Semigroup Forum (2017)

We investigate monotone idempotent n-ary semigroups and provide a generalization of the Czogala–Drewniak Theorem, which describes the idempotent monotone associative functions having a neutral element. We ... [more ▼]

We investigate monotone idempotent n-ary semigroups and provide a generalization of the Czogala–Drewniak Theorem, which describes the idempotent monotone associative functions having a neutral element. We also present a complete characterization of idempotent monotone n-associative functions on an interval that have neutral elements. [less ▲]

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See detailThe discrete Pompeiu problem on the plane
Kiss, Gergely UL; Laczkovich, Miklós; Vincze, Csaba

in Monatshefte für Mathematik (2017)

We say that a finite subset $E$ of the Euclidean plane $\R^2$ has the discrete Pompeiu property with respect to isometries (similarities), if, whenever $f:\R^2\to \C$ is such that the sum of the values of ... [more ▼]

We say that a finite subset $E$ of the Euclidean plane $\R^2$ has the discrete Pompeiu property with respect to isometries (similarities), if, whenever $f:\R^2\to \C$ is such that the sum of the values of $f$ on any congruent (similar) copy of $E$ is zero, then $f$ is identically zero. We show that every parallelogram and every quadrangle with rational coordinates has the discrete Pompeiu property with respect to isometries. We also present a family of quadrangles depending on a continuous parameter having the same property. We investigate the weighted version of the discrete Pompeiu property as well, and show that every finite linear set with commensurable distances has the weighted discrete Pompeiu property with respect to isometries, and every finite set has the weighted discrete Pompeiu property with respect to similarities. [less ▲]

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See detailOn spectral analysis in varieties containing the solutions of inhomogeneous linear functional equations
Kiss, Gergely UL; Vincze, Csaba

in Aequationes Mathematicae (2017)

The aim of the paper is to investigate the solutions of special inhomogeneous linear functional equations using spectral analysis in a translation invariant closed linear subspace of additive ... [more ▼]

The aim of the paper is to investigate the solutions of special inhomogeneous linear functional equations using spectral analysis in a translation invariant closed linear subspace of additive/multiadditive functions containing the restrictions of the solutions to finitely generated fields. The application of spectral analysis in some related varieties is a new and important trend in the theory of functional equations; especially they have successful applications in the case of homogeneous linear functional equations. The foundations of the theory can be found in Kiss and Varga (Aequat Math 88(1):151–162, 2014) and Kiss and Laczkovich (Aequat Math 89(2):301–328, 2015). We are going to adopt the main theoretical tools to solve some inhomogeneous problems due to Koclȩga-Kulpa and Szostok (Ann Math Sylesianae 22:27–40, 2008), see also Koclȩga-Kulpa and Szostok (Georgian Math J 16:725–736, 2009; Acta Math Hung 130(4):340–348, 2011). They are motivated by quadrature rules of approximate integration. [less ▲]

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See detailOn spectral synthesis in varieties containing the solutions of inhomogeneous linear functional equations
Kiss, Gergely UL; Vincze, Csaba

in Aequationes Mathematicae (2017)

As a continuation of our previous work [2] the aim of the recent paper is to investigate the solutions of special inhomogeneous linear functional equations by using spectral synthesis in translation ... [more ▼]

As a continuation of our previous work [2] the aim of the recent paper is to investigate the solutions of special inhomogeneous linear functional equations by using spectral synthesis in translation invariant closed linear subspaces of additive/multiadditive functions containing the restrictions of the solutions to finitely generated fields. The idea is based on the fundamental work of [5]. Using spectral analysis in some related varieties we can prove the existence of special solutions (automorphisms) of the functional equation but spectral synthesis allows us to describe the entire space of solutions on a large class of finitely generated fields. It is spanned by the so-called exponential monomials which can be given in terms of automorphisms of CC and differential operators. We apply the general theory to some inhomogeneous problems motivated by quadrature rules of approximate integration [8], see also [7, 9]. [less ▲]

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See detailDiscrete Pompeiu problem on the plain
Kiss, Gergely UL

Presentation (2016, December)

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See detailA characterisation of associative idempotent nondecreasing functions with neutral elements
Kiss, Gergely UL; Laczkovich, Miklós; Marichal, Jean-Luc UL et al

Scientific Conference (2016, June)

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See detailAn extension of the concept of distance as functions of several variables
Kiss, Gergely UL; Marichal, Jean-Luc UL; Teheux, Bruno UL

in De Baets, Bernard; Mesiar, Radko; Saminger-Platz, Susanne (Eds.) et al 36th Linz Seminar on Fuzzy Set Theory (LINZ 2016) - Functional Equations and Inequalities (2016, February)

Extensions of the concept of distance to more than two elements have been recently proposed in the literature to measure to which extent the elements of a set are spread out. Such extensions may be ... [more ▼]

Extensions of the concept of distance to more than two elements have been recently proposed in the literature to measure to which extent the elements of a set are spread out. Such extensions may be particularly useful to define dispersion measures for instance in statistics or data analysis. In this note we provide and discuss an extension of the concept of distance, called n-distance, as functions of n variables. The key feature of this extension is a natural generalization of the triangle inequality. We also provide some examples of n-distances that involve geometric and graph theoretic constructions. [less ▲]

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See detailDecomposition of balls in R^d
Kiss, Gergely UL; Somlai, Gabor

in Mathematika (2016), 62(2), 378-405

We investigate the decomposition problem of balls into finitely many congruent pieces in dimension d = 2k. In addition, we prove that the d dimensional unit ball B_d can be divided into finitely many ... [more ▼]

We investigate the decomposition problem of balls into finitely many congruent pieces in dimension d = 2k. In addition, we prove that the d dimensional unit ball B_d can be divided into finitely many congruent pieces if d = 4 or d ≥ 6. We show that the minimal number of required pieces is less than 20d if d ≥ 10. [less ▲]

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See detailLinear functional equations, differential operators and spectral synthesis.
Kiss, Gergely UL; Laczkovich, Miklos

in Aequationes Mathematicae (2015), 89(2), 301328

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See detailAlgebraic methods for the solution of linear functional equations
Kiss, Gergely UL; Varga, Adrienn; Vincze, Csaba

in Acta Mathematica Hungarica (2015), 146(1), 128141

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See detailLinear functional equations with algebraic parameters
Kiss, Gergely UL

in Publicationes Mathematicae Debrecen (2014), 85(1-2),

We describe the solutions of linear functional equations with algebraic parameters.

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See detailExistence of nontrivial solutions of linear functional equations.
Kiss, Gergely UL; Varga, Adrienn

in Aequationes Mathematicae (2014), 88(1-2), 151162

We investigate the existence of a solution of linear functional equations.

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See detailHow large dimension guarantees a given angle?
Harangi, Viktor; Keleti, Tamas; Kiss, Gergely UL et al

in Monatshefte für Mathematik (2013), 171(2), 169-187

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See detailDecomposition of balls into finitely many pieces
Kiss, Gergely UL; Laczkovich, Miklos

in Mathematika (2011), 57(1), 89-107

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