Zobrazeno 1 - 10
of 4 168
pro vyhledávání: '"Topological index"'
Publikováno v:
Ecological Processes, Vol 13, Iss 1, Pp 1-19 (2024)
Abstract Background In resource-based cities, long-term irrational exploitation of resources has caused severe damage to ecosystem functions, mainly manifested in the significant decline of biodiversity, land degradation, water pollution, and the det
Externí odkaz:
https://doaj.org/article/742b2eb6b5d24c428a6c419b66d2f381
Autor:
Palaniyappan Nithya, Suresh Elumalai, Selvaraj Balachandran, Akbar Ali, Zahid Raza, Adel A. Attiya
Publikováno v:
Discrete Mathematics Letters, Vol 13, Pp 135-142 (2024)
Externí odkaz:
https://doaj.org/article/b56ed2ecb0984ce991a01930cb9bf683
Publikováno v:
Contributions to Mathematics, Vol 9, Pp 33-37 (2024)
Externí odkaz:
https://doaj.org/article/90a26875fbcd40f199683bcb0c33d413
Publikováno v:
South African Journal of Chemical Engineering, Vol 48, Iss , Pp 121-129 (2024)
Topological indices (TIs) are mathematical codings of the molecular graphs that predict the physicochemical, biological, toxicological, and structural properties of the chemical compounds. To evaluate the physical and chemical properties of molecules
Externí odkaz:
https://doaj.org/article/b94234007cf04e2788bfd728b6b2b13f
Publikováno v:
AIMS Mathematics, Vol 9, Iss 2, Pp 3646-3670 (2024)
We consider two general classes of multiplicative degree-based topological indices (MTIs), denoted by $ X_{\Pi, F_V}(G) = \prod_{u \in V(G)} F_V(d_u) $ and $ X_{\Pi, F_E}(G) = \prod_{uv \in E(G)} F_E(d_u, d_v) $, where $ uv $ indicates the edge of $
Externí odkaz:
https://doaj.org/article/64abeb91b3fd4947bc1975057487d129
Publikováno v:
Heliyon, Vol 10, Iss 17, Pp e37209- (2024)
In chemical graph theory, topological indices play an important role and have various uses in quantitative structure-property relationships (QSPR) as well as quantitative structure-activity relationships (QSARs). The Hosoya index is one of them, perf
Externí odkaz:
https://doaj.org/article/d51dc7342d9148218a1a411bb7cd1d35
Publikováno v:
Heliyon, Vol 10, Iss 14, Pp e33841- (2024)
The sum-connectivity, Randić, and atom-bond connectivity indices have a prominent place among those topological indices that depend on the graph's vertex degrees. The ABS (atom-bond sum-connectivity) index is a variant of all the aforementioned thre
Externí odkaz:
https://doaj.org/article/a38bfee07b734cf892de4481c8a30b77
Publikováno v:
Examples and Counterexamples, Vol 5, Iss , Pp 100129- (2024)
In this paper, we determine some degree-based topological indices, such as the Sombor index, the first and second Zagreb indices, the forgotten topological index, the Narumi–Katayama index, the first and second multiplicative Zagreb indices, the at
Externí odkaz:
https://doaj.org/article/70fd9e4afbc54e12aa516c92cd42a5af
Publikováno v:
Open Mathematics, Vol 22, Iss 1, Pp 351-361 (2024)
The atom-bond sum-connectivity (ABS) index of a graph GG with edges e1,…,em{e}_{1},\ldots ,{e}_{m} is the sum of the numbers 1−2(dei+2)−1\sqrt{1-2{\left({d}_{{e}_{i}}+2)}^{-1}} over 1≤i≤m1\le i\le m, where dei{d}_{{e}_{i}} is the number of
Externí odkaz:
https://doaj.org/article/8e301fe6351a4cb1aec2702110928ff0
Autor:
Tariq A. Alraqad, Igor Ž. Milovanović, Hicham Saber, Akbar Ali, Jaya P. Mazorodze, Adel A. Attiya
Publikováno v:
AIMS Mathematics, Vol 9, Iss 2, Pp 3707-3721 (2024)
Let $ d_u $ be the degree of a vertex $ u $ of a graph $ G $. The atom-bond sum-connectivity (ABS) index of a graph $ G $ is the sum of the numbers $ (1-2(d_v+d_w)^{-1})^{1/2} $ over all edges $ vw $ of $ G $. This paper gives the characterization of
Externí odkaz:
https://doaj.org/article/761cfb1da31345b69b238db0ae24f015