Results 11 to 20 of about 71 (70)

Computing the Hosoya Polynomial of M‐th Level Wheel and Its Subdivision Graph

Journal of Chemistry, Volume 2021, Issue 1, 2021., 2021
The determination of Hosoya polynomial is the latest scheme, and it provides an excellent and superior role in finding the Weiner and hyper‐Wiener index. The application of Weiner index ranges from the introduction of the concept of information theoretic analogues of topological indices to the use as major tool in crystal and polymer studies.
Peng Xu, Muhammad Numan, Aamra Nawaz, Saad Ihsan Butt, Adnan Aslam, Asfand Fahad, Ajaya Kumar Singh   +6 more
wiley   +1 more source

Irregularity Sombor index

, 2022
The irregularity Sombor index ISO is a recently introduced measure for graph irregularity, defined as the sum over all pairs of adjacent ! vertices u, v of the term, where du is the degree of the vertex u.
Kulli, Veerabhadrappa R., Redžepović, Izudin, Gutman, Ivan   +2 more
core  

Topological Invariants for the General Structure of Grape Seed Proanthocyanidins

, 2022
In this paper, we formulate the degree-based topological indicessuch as first Zagreb index, second Zagreb index, third Zagreb index,atom bond connectivity index, geometric-arithmetic (GA) index, generalsum connectivity index, hyper-Zagreb index ...
Muhammad Haroon Aftab; Department of Mathematics and Statistics, The University of Lahore, Lahore, Muhammad Rafaqat; Department of Mathematics and Statistics, The University of Lahore, Lahore, Muhammad Hussain; Department of Mathematics, COMSATS University Islamabad, Lahore campus,   +2 more
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Euler and Gourava Sombor Coindices Bounds and Python‐Based QSPR Modeling for Butane Derivatives and Ocular Pharmaceuticals

Journal of Chemistry, Volume 2026, Issue 1, 2026.
Topological indices are crucial in modeling of molecular structures of graphs and are also useful in correlation with physicochemical properties. In this paper, we propose the Euler Sombor coindex and Gourava Sombor coindex, and we derive bounds by using some graph invariants of a graph such as the degree of a vertex, the order, and the size of a graph.
Suha Wazzan, Gul Ozkan Kizilirmak, Munmun Bardhan   +2 more
wiley   +1 more source

Exploring Graph Product Operations Through Eccentricity Connectivity Coindex: A Comprehensive QSPR Analysis of Octane Isomers

Journal of Mathematics, Volume 2026, Issue 1, 2026.
In this article, the first eccentricity connectivity coindex is introduced as ECI¯G=∑uv∉EGε2u+ε2v, in which ε(u) denotes the eccentricity of the vertex u in the simple connected graph G. Then, the exact expressions are obtained for the first eccentricity connectivity coindex of some graph products.
Suha Wazzan, Gul Ozkan Kizilirmak, Zafar Ullah   +2 more
wiley   +1 more source

Predictive modeling of physical properties in silane compounds using topological descriptors: A computational approach

Main Group Metal Chemistry
Silane compounds are a class of chemical compounds composed of silicon (Si) and hydrogen (H), characterized by the general formula SiH4−xRx{{\rm{SiH}}}_{4-x}{R}_{x}, where RR represents various organic groups. The simplest member of this family is silane
Zhang Xiujun, Yousaf Shamaila, Shahzadi Komal, Ibrahim Sobhy M., Aslam Adnan   +4 more
doaj   +1 more source

Contraharmonic Index: Extremal Results for Unicyclic Graphs and Bounds for General Graphs

Journal of Mathematics, Volume 2026, Issue 1, 2026.
Let G be a graph with edge set E(G). The degree of a vertex w in G is denoted by dw. The contraharmonic index of G is defined as CHG=∑uv∈EGdu+dv−1du2+dv2. In this paper, we investigate several properties of the contraharmonic index, including extremal results for unicyclic graphs of a given order, as well as bounds and the effects of an edge removal in
Abdulaziz Mutlaq Alotaibi, Akbar Ali, Smritijit Sen   +2 more
wiley   +1 more source

Social Capital, Creative Destruction and Economic Development [PDF]

, 2005
This paper develops a conceptual framework for the role of social capital in the political economy of innovation, growth and reform, with illustrations from developing and transition countries.
Dulleck, Uwe, Bezemer, Dirk, Bezemer, Dirk,, Dulleck, Uwe,, Frijters, Paul,, Frijters, Paul   +5 more
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The Second Maximum Mostar Index of Unicyclic Graphs With Given Diameter

Journal of Mathematics, Volume 2026, Issue 1, 2026.
Topological invariants are key tools for studying the physicochemical and thermodynamic properties of chemical compounds. Recently, a new bond‐additive distance‐based graph invariant called the Mostar index has been developed. It measures the importance of individual edges and the graph as a whole. It is denoted and defined as MoG=∑xy∈EGnxxy−nyxy. This
Muhammad Amer Qureshi, Asad Ullah, Parvez Ali, Emad E. Mahmoud, Melaku Berhe Belay, Zafar Ullah   +5 more
wiley   +1 more source

Analysis of Wiener and Hyper‐Wiener Indices in Generalized R‐Vertex Corona and Join Graphs of Diameter at Most Three

Journal of Mathematics, Volume 2026, Issue 1, 2026.
Among various graph products, the corona product continues to inspire novel research. Subdivision graphs play a key role in understanding graph behaviour under edge modifications. The estimation of Wiener index under various graph operations is of considerable importance and has attracted substantial attention in chemical graph theory.
Vimal M., Md. Ashraful Alam, Kalaimurugan G., Vinnarasi L., Ammar Alsinai   +4 more
wiley   +1 more source