Zobrazeno 1 - 10
of 275
pro vyhledávání: '"First Zagreb index"'
Autor:
Rao Li
Publikováno v:
Discrete Mathematics Letters, Vol 14, Pp 31-35 (2024)
Externí odkaz:
https://doaj.org/article/a7032249b44b435e86b58f8a508c0262
Autor:
A. P. Pushpalatha, S. Suganthi
Publikováno v:
Journal of Mechanics of Continua and Mathematical Sciences, Vol 19, Iss 4, Pp 12-28 (2024)
A simple, finite and connected graph is denoted by G=(V,E). The primary Zagreb index, denoted as M1(G), characterizes the graph topologically by representing a squared degree sum of their vertices. Similarly, M2(G) denotes a second Zagreb index, that
Externí odkaz:
https://doaj.org/article/b1b0fc5c378441289cad31eae34ebf5f
Publikováno v:
Heliyon, Vol 10, Iss 16, Pp e36110- (2024)
The Zagreb indices (ZIs) are important graph invariants that are used extensively in many different fields in mathematics and chemistry, such as network theory, spectral graph theory, fuzzy graph theory (FGT) and molecular chemistry, etc. The hyper-Z
Externí odkaz:
https://doaj.org/article/6e8d25d1e6ce43bd959e53bf2853d000
Publikováno v:
Mathematics, Vol 12, Iss 13, p 2043 (2024)
A VDB (vertex-degree-based) topological index over a set of digraphs H is a function φ:H→R, defined for each H∈H as φH=12∑uv∈Eφdu+dv−, where E is the arc set of H, du+ and dv− denote the out-degree and in-degree of vertices u and v res
Externí odkaz:
https://doaj.org/article/47d32eb1e857437d82fe769a51ac7220
Autor:
José Luis Palacios
Publikováno v:
Contributions to Mathematics, Vol 8, Pp 30-37 (2023)
Externí odkaz:
https://doaj.org/article/779db420b0984eef981da75150f8208b
Publikováno v:
Contributions to Mathematics, Vol 7, Pp 53-59 (2023)
Externí odkaz:
https://doaj.org/article/5cd0180c01be4e3a8bc0350df0bf1341
Autor:
Liju Alex, Gopalapillai Indulal
Publikováno v:
Ural Mathematical Journal, Vol 9, Iss 1 (2023)
The first and second Zagreb indices, since its inception have been subjected to an extensive research in the physio- chemical analysis of compounds. In [6] Hanyuan Deng et.al computed the first and second Zagreb indices of four new operations on a gr
Externí odkaz:
https://doaj.org/article/699301fa0ce74a619d4aea24c306a768
Autor:
Stefan D. Stankov, Marjan M. Matejic, Igor Z. Milovanovic, Emina I. Milovanovic, Serife Burcu Bozkurt Altındag
Publikováno v:
Electronic Journal of Mathematics, Vol 1, Pp 101-107 (2021)
Externí odkaz:
https://doaj.org/article/beb2d8f222ad4edcb36c1321e9b66bb7
Publikováno v:
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, Vol 30, Iss 2, Pp 133-160 (2022)
The set Si,n = {0, 1, 2, …, i − 1, i + 1, …, n − 1, n}, 1 ⩽ i ⩽ n, is called Laplacian realizable if there exists a simple connected undirected graph whose Laplacian spectrum is Si,n. The existence of such graphs was established by S. Fal
Externí odkaz:
https://doaj.org/article/aa0a07e498624681862c51b1f503f37c
Publikováno v:
AIMS Mathematics, Vol 7, Iss 7, Pp 11801-11812 (2022)
The first Zagreb index of graphs is defined to be the sum of squares of degrees of all the vertices of graphs. It drew a great deal of attention in the past half-century. In this paper, we study the relationship between the first Zagreb index and Rom
Externí odkaz:
https://doaj.org/article/8dc363a973664472b22d67d35ca456c9