Sommaire du Fascicule no. 1

A Representation for Derangement Numbers in Terms of a Tridiagonal Determinant
New Inequalities on Hermite-Hadamard Utilizing Fractional Integrals
Steiner Harary Index
On Gamma-Rings with $(\sigma,\tau)$-Skew-Commuting and $(\sigma,\tau)$-Skew-Centralizing Mappings
A Notion of $\alpha\beta$-statistical Convergence of Order $\gamma$ in Probability
Periodic Solutions for Impulsive Neutral Dynamic Equations with Infinite Delay on Time Scales
New Subclass of Multivalent Hypergeometric Meromorphic Functions
Extremal Values of Merrifield-Simmons Index for Trees with Two Branching Vertices
Application of Symmetric Bilateral Bailey Transformation
Some Refinements of Certain Gamidov Integral Inequalities on Time Scales and Applications

Sommaire du Fascicule no. 2

Certain Geometric Properties of Analytic Functions Associated with the Convolutions
Ternary Hypergroups of Type U on the Right
On Nontrivial Solutions of Homogeneous Dirichlet Problem for Partial Differential Equations in a Layer
Note on the Randic Energy of Graphs
The Harmonic Index of Edge-Semitotal Graphs, Total Graphs and Related Sums
On gradient $\eta$-Einstein Solitons
Dynamical Systems on Hilbert Modules Over Locally $C^*$-Algebras
Serval Algebraic Identities in $3$-Prime Near-Rings
Vector Valued Hyperstructures
Concircular Curvature Tensor on a P-Sasakian Manifold Admitting a Quarter-Symmetric Metric Connection
Some Monotonicity Properties and Inequalities for the $(p,k)$-Gamma Function
Laplacian Energy of Generalized Complements of a Graph

Sommaire du Fascicule no. 3

Trees with the Minimal Second Zagreb Index
Approximation Results by Certain Genuine Operators of Integral Type
Some Refinements of Hermite-Hadamard Inequality and an Open Problem
On System of Vector Quasi-equilibrium Problems for Multivalued Mappings
A New Class of Four-Point Fractional Sum Boundary Value Problems for Nonlinear Sequential Fractional Difference Equations Involving Shift Operators
Passage of Property $(aw)$ from Two Operators to their Tensor Product
Derivations of $BE$-Algebras from Hyper $BE$-Algebras
Generalized Suzuki Type $\mathcal Z$-Contraction in Complete Metric Spaces
Convergence Analysis of Least Squares-Epsilon-Ritz Algorithm for Solving a General Class of Pantograph Equations
On Prime Labeling of Some Union Graphs
Lie Point Symmetries, Hamiltonian Equations and Conservation Laws of the Geodesics on a Schwarzschild Black Hole

Sommaire du Fascicule no. 4

When is a Bi-Jordan Homomorphism Bi-homomorphism?
Fault-tolerant Metric Dimension Problem: A New Integer Linear Programming Formulation and Exact Formula for Grid Graphs
New Fixed Point Results in Orthogonal Metric Spaces With an Application
Zero-Annihilator Graphs of Commutative Rings
Horadam Sequence Through Recurrent Determinants of Tridiagonal Matrices
Note on the Unicyclic Graphs with the First Three Largest Wiener Indices
A Pointfree Analogues of Lattice-valued Bitopological Spaces
Apostol Type $\left( p,q\right) $-Frobenius-Euler Polynomials and Numbers
Some Inequalities for the Numerical Radius and Rhombic Numerical Radius
Hyers-Ulam-Rassias Stability for the Linear Ordinary Differential Equation of Third Order
Lower Extremities for Generalized Normalized $\delta$-Casorati Curvatures of Bi-slant Submanifolds in Generalized Complex Space Forms
Twist Product Derived from $\Gamma$-semihypergroup
Pseudo Conharmonically Symmetric Spacetimes
Ideals of IS-algebras Based on $\mathcal N$-structures