On the characteristic polynomials of linear functional equations

Vincze, Csaba; Varga, Adrienn

doi:10.1007/s10998-015-0100-5

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…From this we infer that spectral analysis holds in V, i.e., there exists an exponential element in this variety, see Laczkovich-Székelyhidi [12]. An exponential element in this variety is a bi-additive mapping M : L × L → C satisfying (20) such that…”

Section: An Example: the Field Gf(4)mentioning

confidence: 92%

“…with certain fixed scalars α, β ∈ K. For which values of α and β will the function a be non-trivial (that is, non-identically zero)? This question was firstly investigated in Daróczy [6] if X = K = R. These results were later generalized and extended in the papers [7,8,9,10,14,19,20]. To the best of our knowledge, this problem has not been investigated in case of fields with nonzero characteristic.…”

Section: The Non-degenerate Casementioning

confidence: 99%

“…also satisfies (20). Let V be the set of the restrictions of bi-additive mappings of the form B : L × L → C satisfying (20).…”

Section: An Example: the Field Gf(4)mentioning

confidence: 99%

“…also satisfies (20). Let V be the set of the restrictions of bi-additive mappings of the form B : L × L → C satisfying (20). Then the set V is closed with respect to the uniform convergence on finite sets and the field L is countable.…”

Section: An Example: the Field Gf(4)mentioning

confidence: 99%

“…This area is one of the most investigated topic in this field, several authors studied this class, see e.g. [2,3,4,5,6,7,8,9,10,14,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

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On a class of linear functional equations without range condition

2019

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Section: An Example: the Field Gf(4)mentioning

confidence: 92%

Section: The Non-degenerate Casementioning

confidence: 99%

“…also satisfies (20). Let V be the set of the restrictions of bi-additive mappings of the form B : L × L → C satisfying (20).…”

Section: An Example: the Field Gf(4)mentioning

confidence: 99%

Section: An Example: the Field Gf(4)mentioning

confidence: 99%

“…This area is one of the most investigated topic in this field, several authors studied this class, see e.g. [2,3,4,5,6,7,8,9,10,14,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

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On a class of linear functional equations without range condition

2019

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On spectral synthesis in varieties containing the solutions of inhomogeneous linear functional equations

Kiss

Vincze

2017

Aequat. Math.

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As a continuation of our previous work [18] 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 M. Laczkovich and G. Kiss [3]. Using spectral analysis in some related varieties we can prove the existence of special solutions (automorphisms) of the functional equation but the 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 C and differential operators. We apply the general theory to some inhomogeneous problems motivated by quadrature rules of approximate integration [6], see also [7] and [8]. Introduction and preliminariesLet C denote the field of complex numbers. We are going to investigate the family of functional equations of typewhere α i and β i (i = 1, . . . , n) are given real or complex parameters, p = 1, . . . , 2n − 1 and c p ∈ C is a constant depending on p. 1 reasons we pay a special attention to the case of p = 1, i.e.where c 1 is rewritten as c for the sake of simplicity. The problem of solving the family of equations (1) as p runs through its possible values 1, . . . , 2n − 1 is equivalent to the solution of equationwhere x, y ∈ C and f, F : C → C are unknown functions. It is motivated by quadrature rules of approximate integration [6], see also [7] and [8].Remark 1.1. In order to substitute x = 0 or y = 0 into (1) we agree that 0 0 := 1. Such a special choice reproduces the pair of equationsthat are consequences of (3) for monomial solutions of degree p. For a more detailed survey of the preliminary results see [18].Let (G, * ) be an Abelian group; C G denotes the set of complex valued functions defined on G. A function f : G → C is a generalized polynomial, if there is a non-negative integer p such thatfor any g 1 , . . . , g p+1 ∈ G. Here ∆ g is the difference operator defined by, where f ∈ C G and g ∈ G. The smallest p for which (5) holds for any g 1 , . . . , g p+1 ∈ G is the degree of the generalized polynomial f . A function F :for any x ∈ G. It is known that any generalized polynomial function can be written as the sum of generalized monomials [11]. By a general result of M. Sablik [10] any solution of (3) is a generalized polynomial of degree at most 2n − 1 under some mild conditions for the parameters in the functional equation:see also Lemma 2 in [7]. The generalized polynomial solutions of (3) are constituted by the sum of the diagonalizations of p-additive functions satisfying equations of type (1).In what follows we are going to use spectral synthesis in translation invariant closed linear subspaces of additive functions on some finitely generated 2 fields containing the restrictions of the solutions of functional equati...

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On spectral analysis in varieties containing the solutions of inhomogeneous linear functional equations

Kiss

Vincze

2017

Aequat. Math.

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The aim of the paper is to investigate the solutions of special inhomogeneous linear functional equations by 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 case of homogeneous linear functional equations. The foundation of the theory can be found in M. Laczkovich and G. Kiss [2], see also G. Kiss and A. Varga [1]. We are going to adopt the main theoretical tools to solve some inhomogeneous problems due to T. Szostok [5], see also [6] and [7]. They are motivated by quadrature rules of approximate integration.

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On the characteristic polynomials of linear functional equations

Cited by 4 publications

References 8 publications

On a class of linear functional equations without range condition

On a class of linear functional equations without range condition

On spectral synthesis in varieties containing the solutions of inhomogeneous linear functional equations

On spectral analysis in varieties containing the solutions of inhomogeneous linear functional equations

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