Aequationes Mathematicae

Article	Citations
n-gon centers and central lines	39
On a combinatorial identity of Gavrea and Ivan and related results	33
A note on the four color theorem	29
Report of Meeting Aczél100 Hotel Aurum, Hajdúszoboszló (Hungary), February 2–7, 2025	21
On a family of analytic diassociative loops	16
Packing squares into a rectangle with a relatively small area	14
Balanced Stirling numbers	12
Hyers-Ulam stability of a general linear partial differential equation	9
The best Ulam constant of a first-order linear differential operator	7
Casting light on integer compositions	7
Recent progress on minimal hypersurfaces with cylindrical tangent cones	6
A generalization of the cosine addition law on semigroups	6
Continuous selections and collectively fixed point theory with applications to generalized games	6
Vector-valued invariant means	6
Orthogonality induced by norm derivatives: a new geometric constant and symmetry	5
A class of functional equations for additive functions	5
Comparability of Metrics and Norms in terms of Basis of Exponential Vector Space	5
Equalities for mixed operations of Moore–Penrose and group inverses of a matrix	5
On an equality of means and a characterization of the logarithmic mean	5
Difference-differential fields of continuous functions	5
Discrete Time-dependent wave equations II. Semiclassical Fractional Klein-Gordon equation	5
Regularity properties of k-Brjuno and Wilton functions	4
Correction to: There is at most one continuous invariant mean	4
Matrix inequalities between $$f(A)\sigma f(B)$$ and $$A\sigma B$$	4
Correction to: Vector-valued Banach limits and the linear span property	4

Functional equations stemming from ‘scientific laws’	4
Extreme area and perimeter bisectors in a triangle	4
The number of independent sets in bipartite graphs and benzenoids	4
Weakly associative functions and means - new examples and open questions	4
Continuous dependence of the weak limit of iterates of some random-valued vector functions	4
Perturbations of Cauchy differences	4
Uniformly-like convex solutions for the polynomial-like iterative equation in Banach spaces	3
On two functional equations of finite order and their complex-valued solutions with prescribed asymptotics	3
Invariance problems of generalized weighted classical means	3
Explicit forms of invariant means: complementary results to Gauss $$\left( {\mathcal {A}},{\mathcal {G}}\right) $$-theorem and some applications	3
Adjacencies for recognition of digital Jordan surfaces	3
Randomly r-orthogonal factorizations in bipartite graphs	3
A generalization of the Kannappan-sine addition law on semigroups	3
On iterative roots of injective functions	3
On some linear functional equations with continuous solutions	3
A new equation related to two-sided centralizers in prime rings	3
Global asymptotic stability of one time-continuous model and its time-discrete variant for basic virus dynamics	3
On q-generalized (r, s)-Stirling numbers	3
Further results on positively homogeneous subadditive functions by using Csiszár f-divergence	3
A functional equation related to Wigner’s theorem	3
A study on Davison’s functional equation for set-valued functions	3
On multiadditive set-valued maps “modulo K”	3
Dimension preserving approximation	3
Additive operators approximately preserving Birkhoff–James orthogonality	3
László Székelyhidi	3
Skew Dyck paths with air pockets	2
A note on second differences in product form in two variables	2
On strongly m-convex stochastic processes	2
On the Li–Zheng theorem	2
Extending EP matrices by means of recent generalized inverses	2
Proof of a conjecture due to Chu on Gosper-type sums	2
General hyperstability criteria for Jensen-type equations	2
An Application of Viscosity Approximation Type Iterative Method in the Generation of Mandelbrot and Julia Fractals	2
A symmetric function approach to polynomial regression	2
More results on the signed double Roman k-domination in graphs	2
Operators with a non-trivial closed invariant affine subspace	2
A tribute to János Aczél	2
Stability of $$\varepsilon $$-isometries and their symmetrizations on the positive cones of $$c_0$$	2
Some investigations on the U-partial order induced by uninorms	2
A method to find any solution of $$f(p(x)) = q(f(x))$$ with given strictly increasing continuous real functions p, q	2
On an alternative additive-quadratic functional equation	2
On certain composite functional equations associated with the Dirichlet function	2
Block-Toeplitz Operators On the Hardy Space Induced by a Tracial Unital Banach $$*$$-Probability Space	2
Solutions to the operator equation $$f(XX^*)=g(X^*X)$$	2
A characterization of the Euclidean ball via antipodal points	2
Odd strength spherical designs attaining the Fazekas–Levenshtein bound for covering and universal minima of potentials	2
On metric stability of set-valued subadditive functions	2
On surface of Apollonius of two ellipsoids	2
Sparse groups need not be semisparse	2
New generalizations of Steffensen’s inequality by Lidstone’s polynomial	2

Some explicit values of a q-multiple t-function at roots of unity	2
Global asymptotic stability of one time-continuous and two time-discrete models for ethanol metabolism in the human body	2
Some new minimax inequalities for centered convex bodies	2
A Kannappan-sine subtraction law on semigroups	2
Zero utility principles coinciding on binary risks	2
On the equality problem of two-variable Bajraktarević means under first-order differentiability assumptions	2
A classification of non-monotonicity height for piecewise monotone functions (I): increasing case	2
Extensions of the sine addition law with an extra term	2
Pexider invariance equation for embeddable mean-type mappings	2
On digital sequences associated with Pascal’s triangle	2
Angular structure of equiangular cones in Euclidean spaces	2
Bisector fields and pencils of conics	2
The values of zeta functions composed by the Hurwitz and periodic zeta functions at integers	2
A note on homotopy extension KKM type maps	2
Characterizations of weighted generalized inverses	2
New lower bound for the optimal congruent geodesic ball packing density of screw motion groups in $$\textbf{H}^2\!\times \!\textbf{R}$$ space	2
Characterizations of Lipschitz functions via the commutators of fractional maximal function in total Morrey spaces on stratified Lie groups	1
$$C_{2}$$-cyclic means	1
Transitive quasi-uniform structures depending on a parameter	1
Quaternion-valued multiplicative functions on semigroups	1
Continuous solutions of a system of composite functional equations	1
The minmin coalition number in graphs	1
On a variant of Tingley’s problem for $$\ell ^p(\Gamma , H)$$ spaces for $$p\in [1, \infty ]$$	1
Another look at the Matkowski and Wesołowski problem yielding a new class of solutions	1
Max and min phase-isometries on the unit sphere of $$\ell _p(\Gamma )$$-type spaces for $$p>0$$	1
Clique trees with a given zero forcing number maximizing the $$A_\alpha $$-spectral radius	1
d-Young distance function and existence of fixed points in complete metric spaces	1
Sorting 1-away permutations with underlying Fibonacci convolutions	1
Graceful Antimagic Injection via Combinatorial Nullstellensatz	1
Discrete time scales with two quanta and Ulam stability	1
Generalizations of certain conditions for Drazin inverse expressions of anti-triangular partitioned matrices	1
A method for determining the mod-$$p^k$$ behaviour of recursive sequences	1
Some study of the approximate Birkhoff orthogonality and orthogonality of bounded linear operators	1
Refinements of discrete and integral Jensen inequalities with Jensen’s gap	1
Some sufficient conditions for path-factor uniform graphs	1
Kamke functions for stability of interconnected systems	1
On the maximal part in unrefinable partitions of triangular numbers	1
On evolutes of curves in the isotropic plane	1
Characterizing spanning trees via the size or the spectral radius of graphs	1
Another approach to K-subadditivity	1
Poncelet Pairs via Isogonal Conjugacy	1
The isoperimetric problem for hyperideal polyhedra, part I	1
A generalization of a theorem of von Neumann	1
Isometry groups of six-dimensional nilmanifolds	1
Darboux and shift-compactness paradigms: Automatic continuity in the Gołąb-Schinzel and the Goldie equations	1
Quadratic functions fulfilling an additional condition along the hyperbola $$\pmb {xy = 1} $$	1
Local P-th Mean Stability of Scalar SDEs with Infinite Memory By Contraction Mapping Principle on Weak Banach Spaces	1
On the solvability of the (SSIE) with operator $${D}_{x} {\mathbf { * }}\left( { s}_{ R}^{{\textbf{0}}} \right) _{{{{\Sigma }} - {\lambda I}}} {{ \subset }}{ s}_{ R}^{{{0}}} $$, involving the fine spe	1
Overpartitions in terms of 2-adic valuation	1
On sets related to integer partitions with quasi-required elements and disallowed elements	1
Refinements of Jensen’s inequality by uniformly convex functions	1
On monohedral tilings of a regular polygon	1
Inequalities characterizing differential operators	1
A two-vertex theorem for normal tilings	1
On some classes of multiplicative functions	1
Computer assisted investigation of alienness of linear functional equations	1
Generalized orthogonality equations in normed spaces	1
On double Roman domination problem for several graph classes	1
Enumeration of labeled connected bipartite graphs with given Betti number	1
Spanning subgraphs and spectral radius in graphs	1
Functional equations, alternating expansions, and generalizations of the Salem functions	1
About Sobolev spaces on fractals: fractal gradians and Laplacians	1
Maker-Breaker resolving game played on corona products of graphs	1
Report of Meeting The 61st International Symposium on Functional Equations, Cluj-Napoca (Romania), June 15–21, 2025	1
On Jensen’s inequality involving divided differences of convex functions	1
Note on the variance of generalized random polygons	1
The Artin-Hasse series and Laguerre polynomials modulo a prime	1
Hyers-Ulam stability of an  iterative  equation  for  strictly increasing continuous functions	1
Some characterizations of the disc by properties of isoptic triangles	1
Exponential semi-polynomials and their characterization on semigroups	1
Prefixes of bargraph paths	1
Weakly contractive in mean random-valued functions and two linear functional equations	1
Characterization of the Bernoulli polynomials via the Raabe functional equation	1
The monomial functional equation for connected Lie groups	1
Independent mutual-visibility coloring and related concepts	1
A necessary condition for cylindrical curves in terms of curvature and torsion	1
Set-valued dynamics related to convex-valued m-mappings	1
Angular structure of Reuleaux cones	1
Mountain-climbing constructions for piecewise monotone functions	1
On conditions determining formal automorphisms of integro-differential operators	1

Vector valued invariant means, complementability and almost constrained subspaces	1
On the $${A_{\!\mathbb {C}}}$$-rank of multidigraphs	1
Mathematical models of functional extreme leaning machins: operator-algebraic and free-probabilistic approaches	1
On centrality of solutions of generalized addition and subtraction laws	1
Elephant polynomials	1
Complex ellipsoids and complex symmetry	1
The isoperimetric problem for hyperideal polyhedra, part II	1
Correction: On two functional equations of finite order and their complex-valued solutions with prescribed asymptotics	1
Convex Meir-Keeler-Ćirić-Matkowski contractive mappings and their application to functional equation arising in the behavioral study of paradise fish and predator-prey models on the Lipschitz spaces	1
Constructing Ricci vector fields on $${\mathbb {R}}^2$$ with a diagonal metric	1
On distance spectral radius of graphs with given number of pendant paths of fixed length	1
Finite dimensional varieties over the Heisenberg group	1
A Novel Three-Step Fixed-Point Iteration Scheme for Robust Solutions Finding and Applications	1
On composition and Right Distributive Law for formal power series of multiple variables	1
On the functional equation $$\hbox {f}(\hbox {x}+\hbox {y})=\hbox {g}(\hbox {xy})$$	1
Points of monotonicity in F-normed Orlicz function spaces	1
The d-distance p-packing domination number: complexity, cycles, and trees	1
On and around the balanced Cauchy equation	1
On polyhedral graphs and their complements	1
Distributivity and conditional distributivity of bi-uninorms over uninorms	1
New constructions of t-norms and t-conorms on bounded lattices	0
A note on iterated maps of the unit sphere	0
Alienation of the quadratic, exponential and d’Alembert functional equations	0
Super-regular polytopes in cyclotomic hypercubes	0
Certain singular functions defined by positive and alternating Lüroth series	0
$${\Sigma }$$-Modules in cotorsion Pairs	0
Hlawka’s functional inequality almost everywhere	0
Generalized results on Levinson-type inequalities via Green functions and Fink’s identity	0
Spectra for upper triangular linear relation matrices through local spectral theory	0
The 58th International Symposium on Functional Equations Bilesdungshaus Grillhof, Innsbruck (Austria), June 19–26, 2022 Dedicated to the memory of János Aczél, founder of the Symposia	0
Vector-valued Banach limits and the linear span property	0
Radon and Carathéodory type theorems for staircase convexity	0
Behavior of convex integrand at a d-apex of its Wulff shape and approximation of spherical bodies of constant width	0
On spectral irregularity of graphs	0
On 1-König-Egerváry Graphs	0
Bounds on the first outdegree Zagreb index of digraphs	0
On the minimality of the Winterbottom shape	0
Hyers–Ulam stability of integral equations with infinite delay	0
Monomial functions, normal polynomials and polynomial equations	0
Convex functions and approximate Birkhoff–James orthogonality	0
On measure of noncompactness in Lebesgue and Sobolev spaces with an application to the functional integro-differential equation	0
Cauchy product of iterative functional equation	0
The sine addition law applied to a cosine equation	0
A note on convex solutions to an equation on open intervals	0
Iterative roots of PM functions extended from the characteristic interval	0
A geometric constant for quantifying the differences between approximate orthogonality types	0
On the barycenter for discrete Steffensen Popoviciu measures on global NPC spaces	0
On supertranslativity of the Orlicz premium principle	0
On the Jensen convexity of quasideviation and Bajraktarević means	0
The Goldie Equation: III. Homomorphisms from functional equations	0
Characterizations of derivations on spaces of smooth functions	0
Some moduli related to $$\rho _{\pm }$$-orthogonalities and semi-orthogonality in Banach spaces	0
Some construction approaches for t-norms and t-conorms on bounded lattices	0
A class of series representations for Catalan’s constant	0
Vortex filament flows for curves in a 3-dimensional pseudo-Riemannian manifold	0
On even orthogonally additive mappings in orthogonality spaces	0
Curves that allow the motion of a regular polygon	0
Independent transversal domination in trees, products and under local changes to a graph	0
Paired-domination game played on paths	0
Deviation from equidistance for one-dimensional sequences	0
A characterization of the set of all integers by a composite functional equation	0
An alternative equation for generalized monomials	0
An upper bound of the density for packing of congruent hyperballs in hyperbolic $$3-$$space	0
Some extremal problems for polygons in the Euclidean plane	0
Rotation number of 2-interval piecewise affine maps	0
Best Ulam constant of a partial differential operator	0
Maximal and minimal nondecreasing Lipschitzian solutions of an iterative functional equation	0
On the state of the second part of Hilbert’s fifth problem	0
A note on the problem of the parallelogram of forces (the axiomatization of vector addition)	0
Conditional equations for additive functions on conic sections	0
Levin–Cochran–Lee inequalities and best constants on homogeneous groups	0
Position of the centroid of a planar convex body	0
Extending domains in the section method	0
On a generalized notion of metrics	0
Continuous selecting families and collectively fixed point theory	0
Measuring movement of incomes and income mobility	0
On when the union of two algebraic sets is algebraic	0
Fractal Laplace transform: The boundedness in Fractal Lebesgue spaces	0
Minimal codewords in Norm-Trace codes	0
Cosine subtraction laws	0
Quantum dynamics of elliptic curves	0
General criteria for hyperstability of Cauchy-type equations	0
Maciej Sablik	0
Set valued pexiderized quadratic functional equation	0
On forward-order law for core inverse in rings	0
Semi-classical 2-dimensional Minkowski planes	0
On computable classes of equidistant sets: multivariate equidistant functions	0
On the geometry of polynomials acting on the unit circle	0
Iterated rascal triangles	0
A Pexider equation containing the aritmetic mean	0
$$\varepsilon $$-isometries in $$l^n_1$$	0
Asymptotic expansions of the Archimedean compounds	0
Twisted coefficients on coarse spaces and their corona	0
On quadrature means	0
Rigidity of hypersurfaces and Moser–Bernstein type results in certain warped products, with applications to pseudo-hyperbolic spaces	0