Results 1 to 10 of about 76,182 (120)

Gutman index‎, ‎edge-Wiener index and edge-connectivity [PDF]

open access: yesTransactions on Combinatorics, 2020
‎We study the Gutman index ${\rm Gut}(G)$ and the edge-Wiener index $W_e (G)$ of connected graphs $G$ of given order $n$ and edge-connectivity $\lambda$‎.
Jaya Mazorodze   +2 more
doaj   +1 more source

Ve-Degree, Ev-Degree, and Degree-Based Topological Indices of Fenofibrate

open access: yesJournal of Mathematics, 2022
The molecular topology of a graph is described by topological indices, which are numerical measures. In theoretical chemistry, topological indices are numerical quantities that are used to represent the molecular topology of networks.
Sadik Delen   +6 more
doaj   +1 more source

On Some Ve-Degree and Harmonic Molecular Topological Properties of Carborundum

open access: yesARO-The Scientific Journal of Koya University, 2020
Carborundum, also known as silicon carbide which containing carbon and silicon, is a semiconductor. Molecular topological properties of physical substances are important tools to investigate the underlying topology of these substances.
Murat Cancan   +3 more
doaj   +1 more source

Extremal topological indices of some nanostructures

open access: yesHeliyon, 2023
In this work, general formulas of degree-based and neighborhood degree sum-based topological indices for a 2D lattice of H-Naphtalenic nanotubes and pent-heptagonal nanosheets are determined.
Shivani Rai   +3 more
doaj   +1 more source

Ambrosetti-Prodi-type results for a class of difference equations with nonlinearities indefinite in sign

open access: yesOpen Mathematics, 2022
In this article, we are concerned with the periodic solutions of first-order difference equation Δu(t−1)=f(t,u(t))−s,t∈Z,(P)\Delta u\left(t-1)=f\left(t,u\left(t))-s,\hspace{1em}t\in {\mathbb{Z}},\hspace{1.0em}\hspace{1.0em}\left(P) where s∈Rs\in {\mathbb{
Zhao Jiao, Ma Ruyun
doaj   +1 more source

Existence result for a nonlinear elliptic problem by topological degree in Sobolev spaces with variable exponent

open access: yesMoroccan Journal of Pure and Applied Analysis, 2021
The aim of this paper is to establish the existence of solutions for a nonlinear elliptic problem of the ...
Ait Hammou Mustapha, Azroul Elhoussine
doaj   +1 more source

Novel Degree-Based Topological Descriptors of Fenofibrate Using M-Polynomial

open access: yesJournal of Mathematics, 2023
Chemical graph theory is currently expanding the use of topological indices to numerically encode chemical structure. The prediction of the characteristics provided by the chemical structure of the molecule is a key feature of these topological indices ...
Muhammad Kamran   +6 more
doaj   +1 more source

M-Polynomials and Degree-Based Topological Indices of the Molecule Copper(I) Oxide

open access: yesJournal of Chemistry, 2021
Topological indices are numerical parameters used to study the physical and chemical residences of compounds. Degree-based topological indices have been studied extensively and can be correlated with many properties of the understudy compounds.
Faryal Chaudhry   +5 more
doaj   +1 more source

Existence of solutions to second-order boundary value problems without growth restrictions

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2016
This article investigates nonlinear, second-order ordinary differential equations subject to various two-point boundary conditions. A condition is introduced that ensures a priori bounds on the derivatives of solutions to the problem.
Christopher Tisdell
doaj   +1 more source

On a sign-changing solution for some fractional differential equations

open access: yesBoundary Value Problems, 2017
In this paper, a kind of αth ( 3 < α ≤ 4 ...
Kemei Zhang
doaj   +1 more source

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