Results 81 to 90 of about 10,946,765 (186)

On Zagreb Eccentricity Indices [PDF]

, 2011
Zagreb eccentricity indices were proposed analogously to Zagreb indices already known and used for almost forty years. For a connected graph, the first Zagreb eccentricity index is defined as the sum of the squares of the eccentricities of the vertices,
Zhou, Bo, Xing, Rundan, Trinajstić, Nenad   +2 more
core   +1 more source

Ocular related emergencies in Zagreb University Hospital Centre - ten month analysis [Oftalmološka hitna stanja u Kliničkom bolničkom centru Zagreb - desetmjesečna analiza] [PDF]

, 2013
To determine number, demographic characteristics and presenting symptoms of patients admitted to Emergency ophthalmologic department of Zagreb University hospital centre.
Kordić, Rajko, Jandroković, Sonja, Kuzman, Tomislav, Barišić Kutija, Marija, Jukić, Tomislav, Škegro, Ivan, Perić, Sanja   +6 more
core   +1 more source

Bipartite graphs with the maximal value of the second Zagreb index

, 2013
The second Zagreb index of a graph G is an adjacency-based topological index, which is defined as ?uv?E(G)(d(u)d(v)), where uv is an edge of G, d(u) is the degree of vertex u in G.
Husna Zayadi
core  

Relations between the first and second Zagreb indices of subdivision graphs

, 2018
The first and second Zagreb indices of a graph are two of the topological invariants used in molecular calculations by Mathematicians and Chemists. First Zagreb index and multiplicative Zagreb indices, all versions of Zagreb indices of subdivision graphs,
Togan, Müge, Cangül, İsmail Naci, Yurttaş, Aysun   +2 more
core   +1 more source

The maximal tree with respect to the exponential of the second Zagreb index

, 2020
The second Zagreb index is $M_2(G)=\sum_{uv\in E(G)}d_{G}(u)d_{G}(v)$. It was found to occur in certain approximate expressions of the total $π$-electron energy of alternant hydrocarbons and used by various researchers in their QSPR and QSAR studies. Recently the exponential of a vertex-degree-based topological index was introduced.
Zeng, Mingyao, Deng, Hanyuan
openaire   +2 more sources

On Zagreb indices and coindices [PDF]

, 2015
A complete set of relations is established between the first and second Zagreb index and coindex of a graph and of its complements. Formulas for the first Zagreb index of several derived graphs are also obtained.
Popivoda, Goran, Kovijanić Vukićević, Žana, Furtula, Boris, Gutman, Ivan   +3 more
core  

A short note on hyper Zagreb index

, 2017
In this paper, we present and analyze the upper and lower bounds on the Hyper Zagreb index $\chi^2(G)$ of graph $G$ in terms of the number of vertices $(n)$, number of edges $(m)$, maximum degree $(\Delta)$, minimum degree $(\delta)$ and the inverse ...
Mohammad Ali Rostami, Gnanadhass Britto Antony Xavier, Suresh Elumalai, Toufik Mansour   +3 more
core   +1 more source

Modeling benzene physicochemical properties using Zagreb upsilon indices

Open Chemistry
Quantitative structure–property relationship (QSPR) frameworks leverage topological indices to model the physicochemical attributes of molecular structures.
Çiftçi İdris, Yamaç Kerem, Denizler İsmail Hakkı   +2 more
doaj   +1 more source

Reformulated Zagreb Index

, 2020
The edge version of traditional first Zagreb index is known as first reformulated Zagreb index. In this paper, we analyze and compare various lower and upper bounds for the first reformulated Zagreb index and we propose new lower and upper bounds which ...
T Mansour, E Suresh, G B A Xavier, M A Rostami   +3 more
core  

Majorization under constraints and bounds of the second Zagreb index

, 2011
In this paper we present a theoretical analysis in order to establish maximal and minimal vectors with respect to the majorization order of particular subsets of
Torriero, Anna, Bianchi, Monica, Cornaro, Alessandra   +2 more
core