OOIR: Observatory of International Research

Papers

(The TQCC of Aequationes Mathematicae is 1. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2021-06-01 to 2025-06-01.)

Article	Citations
Hyers-Ulam stability of a general linear partial differential equation	55
A note on the four color theorem	31
n-gon centers and central lines	26
On a combinatorial identity of Gavrea and Ivan and related results	16
Balanced Stirling numbers	12
Packing squares into a rectangle with a relatively small area	7
Casting light on integer compositions	7
A generalization of the cosine addition law on semigroups	6
Equalities for mixed operations of Moore–Penrose and group inverses of a matrix	6
Common positive solutions for two non-linear matrix equations using fixed point results in b-metric-like spaces	5
Recent progress on minimal hypersurfaces with cylindrical tangent cones	5
Bases consisting of self-referential functions in Banach spaces	5
A divided-difference characterization of polynomials over finite fields of characteristic two	5
Vector-valued invariant means	5
Further results on positively homogeneous subadditive functions by using Csiszár f-divergence	4
Homogeneity of isosceles orthogonality, transitivity of the norm, and characterizations of inner product spaces	4
Discrete Time-dependent wave equations II. Semiclassical Fractional Klein-Gordon equation	4
Regular polygons on isochordal-viewed hedgehogs	4
Global forcing number for maximal matchings in corona products	4
On linear functional equations modulo $${\mathbb {Z}}$$	4
Regular solutions of a functional equation derived from the invariance problem of Matkowski means	4
On q-generalized (r, s)-Stirling numbers	4
Functional equations stemming from ‘scientific laws’	4
A class of functional equations for additive functions	4
Orthogonality induced by norm derivatives: a new geometric constant and symmetry	4

The singular evolutoids set and the extended evolutoids front	4
Continuous dependence of the weak limit of iterates of some random-valued vector functions	4
Means, Milne’s inequality, and quadrilateral area	4
Extreme area and perimeter bisectors in a triangle	4
The number of independent sets in bipartite graphs and benzenoids	4
Continuous selections and collectively fixed point theory with applications to generalized games	4
Regularity properties of k-Brjuno and Wilton functions	4
Correction to: There is at most one continuous invariant mean	4
Characterization of affine differences and related forms	3
Linear functional equations and their solutions in generalized Orlicz spaces	3
On iterative roots of injective functions	3
Adjacencies for recognition of digital Jordan surfaces	3
Dimension preserving approximation	3
A new equation related to two-sided centralizers in prime rings	3
Explicit forms of invariant means: complementary results to Gauss $$\left( {\mathcal {A}},{\mathcal {G}}\right) $$-theorem and some applications	3
Matrix inequalities between $$f(A)\sigma f(B)$$ and $$A\sigma B$$	3
A generalization of the Kannappan-sine addition law on semigroups	3
A functional equation related to Wigner’s theorem	3
Complementary means with respect to a nonsymmetric invariant mean	2
A Kannappan-sine subtraction law on semigroups	2
Sparse groups need not be semisparse	2
Bisector fields and pencils of conics	2
Extending EP matrices by means of recent generalized inverses	2
A characterization of the Euclidean ball via antipodal points	2
New generalizations of Steffensen’s inequality by Lidstone’s polynomial	2
An Application of Viscosity Approximation Type Iterative Method in the Generation of Mandelbrot and Julia Fractals	2
László Székelyhidi	2
Stability of $$\varepsilon $$-isometries and their symmetrizations on the positive cones of $$c_0$$	2
Fejér type inequalities for higher order convex functions and quadrature formulae	2
Set-valued solutions of a two-variable functional equation with involutions	2
Refining the Hermite-Hadamard inequalities for operator convex maps in multiple operator variables	2
Proof of a conjecture due to Chu on Gosper-type sums	2
Some new minimax inequalities for centered convex bodies	2
Odd strength spherical designs attaining the Fazekas–Levenshtein bound for covering and universal minima of potentials	2
Pexider invariance equation for embeddable mean-type mappings	2
Characterizations of weighted generalized inverses	2
Uniformly-like convex solutions for the polynomial-like iterative equation in Banach spaces	2
Operators with a non-trivial closed invariant affine subspace	2
Randomly r-orthogonal factorizations in bipartite graphs	2
On metric stability of set-valued subadditive functions	2
The solvability cardinal of the class of polynomials	2
On the equality problem of two-variable Bajraktarević means under first-order differentiability assumptions	2
Zero utility principles coinciding on binary risks	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
A note on homotopy extension KKM type maps	2
Angular structure of equiangular cones in Euclidean spaces	2
General hyperstability criteria for Jensen-type equations	2
Kadec-Klee property in Musielak-Orlicz function spaces equipped with the Orlicz norm	2
Skew Dyck paths with air pockets	2
A classification of non-monotonicity height for piecewise monotone functions (I): increasing case	2

A study on Davison’s functional equation for set-valued functions	2
On digital sequences associated with Pascal’s triangle	2
Some investigations on the U-partial order induced by uninorms	2
On strongly m-convex stochastic processes	2
On surface of Apollonius of two ellipsoids	2
On the functional equation $$\hbox {f}(\hbox {x}+\hbox {y})=\hbox {g}(\hbox {xy})$$	1
Extensions of the sine addition law with an extra term	1
Refinements of Jensen’s inequality by uniformly convex functions	1
On an alternative additive-quadratic functional equation	1
Axiomatic characterization of the $$\chi ^{2}$$ dissimilarity measure	1
Another approach to K-subadditivity	1
Alienation of Drygas’, Cauchy’s, Jensen’s and the quadratic equations on semigroups with an involutive automorphism	1
Mountain-climbing constructions for piecewise monotone functions	1
Clique trees with a given zero forcing number maximizing the $$A_\alpha $$-spectral radius	1
Refinements of discrete and integral Jensen inequalities with Jensen’s gap	1
The Artin-Hasse series and Laguerre polynomials modulo a prime	1
Transitive quasi-uniform structures depending on a parameter	1
Exponential semi-polynomials and their characterization on semigroups	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
On composition and Right Distributive Law for formal power series of multiple variables	1
A generalization of a theorem of von Neumann	1
About Sobolev spaces on fractals: fractal gradians and Laplacians	1
On the maximal part in unrefinable partitions of triangular numbers	1
Angular structure of Reuleaux cones	1
Mathematical models of functional extreme leaning machins: operator-algebraic and free-probabilistic approaches	1
On some classes of multiplicative functions	1
Vector valued invariant means, complementability and almost constrained subspaces	1
Sections and projections of nested convex bodies	1
On the Li–Zheng theorem	1
Sections in functional equations: stability and hyperstability	1
Characterizing spanning trees via the size or the spectral radius of graphs	1
On monohedral tilings of a regular polygon	1
Quaternion-valued multiplicative functions on semigroups	1
Some study of the approximate Birkhoff orthogonality and orthogonality of bounded linear operators	1
On the $${A_{\!\mathbb {C}}}$$-rank of multidigraphs	1
Some sufficient conditions for path-factor uniform graphs	1
A two-vertex theorem for normal tilings	1
On the critical exponents of generalized ballot sequences in three dimensions and large tandem walks	1
On and around the balanced Cauchy equation	1
Overpartitions in terms of 2-adic valuation	1
On isoptics and isochordal-viewed curves	1
Discrete time scales with two quanta and Ulam stability	1
Functional equations, alternating expansions, and generalizations of the Salem functions	1
Sorting 1-away permutations with underlying Fibonacci convolutions	1
Some characterizations of the disc by properties of isoptic triangles	1
Maker-Breaker resolving game played on corona products of graphs	1
On polyhedral graphs and their complements	1
Distributivity and conditional distributivity of bi-uninorms over uninorms	1
Prefixes of bargraph paths	1
K-subadditive and K-superadditive set-valued functions bounded on “large” sets	1
On evolutes of curves in the isotropic plane	1
Isometry groups of six-dimensional nilmanifolds	1
Points of monotonicity in F-normed Orlicz function spaces	1
Quadratic functions fulfilling an additional condition along the hyperbola $$\pmb {xy = 1} $$	1
On Cesàro triangles and spherical polygons	1
Finite dimensional varieties over the Heisenberg group	1
Entropy results for Levinson-type inequalities via Green functions and Hermite interpolating polynomial	1
Row-summable matrices with application to generalization of Schröder’s and Abel’s functional equations	1
When are maps preserving semi-inner products linear?	1
Set-valued dynamics related to convex-valued m-mappings	1
Hyers-Ulam stability of an iterative equation for strictly increasing continuous functions	1
The minmin coalition number in graphs	1
Elephant polynomials	1
The monomial functional equation for connected Lie groups	1
On Jensen’s inequality involving divided differences of convex functions	1
Characterization of the Bernoulli polynomials via the Raabe functional equation	1
Note on the variance of generalized random polygons	1
On distance spectral radius of graphs with given number of pendant paths of fixed length	1