Results 21 to 30 of about 2,865,251 (255)

Topological Study of Zeolite Socony Mobil-5 via Degree-Based Topological Indices

open access: yesJournal of Chemistry, 2021
Graph theory is a subdivision of discrete mathematics. In graph theory, a graph is made up of vertices connected through edges. Topological indices are numerical parameters or descriptors of graph.
Nouman Saeed   +4 more
doaj   +1 more source

Topological degree and quadratic forms [PDF]

open access: yes, 1999
The paper presents methods of computing the topological degree, and other related topological invariants, for real polynomial mappings. There is also introduced a new topological invariant, similar to the topological degree (mod2), for mappings on ...
Szafraniec, Zbigniew
core   +1 more source

Topological Degree via a Degree of Nondensifiability and Applications

open access: yesAxioms
The goal of this work is to introduce the notion of topological degree via the principle of the degree of nondensifiability (DND for short). We establish some new fixed point theorems, concerning, Schaefer’s fixed point theorem and the nonlinear ...
Noureddine Ouahab   +2 more
doaj   +1 more source

Self-stabilizing temperature driven crossover between topological and non-topological ordered phases in one-dimensional conductors [PDF]

open access: yes, 2015
We present a self-consistent analysis of the topological superconductivity arising from the interaction between self-ordered localized magnetic moments and electrons in one-dimensional conductors in contact with a superconductor.
Simon, Pascal, Braunecker, Bernd
core   +1 more source

Degree and Neighborhood Degree Sum-based Topological Characteristics of Zosurabalpin: a Novel Drug for Managing Antibiotic-resistant Infection

open access: yesScientific Annals of Computer Science
This article is concerned with the topological characterization of the antibiotic Zosurabalpin through the computation of degree and associated neighborhood degree sum-based topological indices.
Shibsankar Das   +4 more
doaj   +1 more source

Topological Quantum Field Theory and the Geometric Langlands Correspondence [PDF]

open access: yes, 2013
In the pioneering work of A. Kapustin and E. Witten, the geometric Langlands program of number theory was shown to be intimately related to duality of GL-twisted N=4 super Yang-Mills theory compactified on a Riemann surface. In this thesis, we generalize
Setter, Kevin Luke
core   +1 more source

A new result on the existence of periodic solutions for Liénard equations with a singularity of repulsive type

open access: yesJournal of Inequalities and Applications, 2017
In this paper, the problem of the existence of a periodic solution is studied for the second order differential equation with a singularity of repulsive type x ″ ( t ) + f ( x ( t ) ) x ′ ( t ) − g ( x ( t ) ) + φ ( t ) x ( t ) = h ( t ) , $$x''(t)+f ...
Shiping Lu
doaj   +1 more source

A refined estimate for the topological degree [PDF]

open access: yes, 2017
We sharpen an estimate of [4] for the topological degree of continuous maps from a sphere Sdinto itself in the case d >= 2. This provides the answer for d >= 2 to a question raised by Brezis. The problem is still open for d = 1.
Nguyên, Hoài-Minh, Hoai-Minh Nguyen
core   +3 more sources

The complex networks of earth minerals and chemical elements [PDF]

open access: yes, 2008
We study the large-scale organization of the mineral-mineral (MMN) and element-element (EEN) complex networks by analyzing their topological structures.
Estrada, Ernesto   +3 more
core   +3 more sources

Topological Descriptors on Some Families of Graphs

open access: yesJournal of Chemistry, 2021
In view of the successful applications of graph theory, relationships between the biological activity and chemical structure have been developed. One of the popular topics in graph theory is problems relating to topological indices.
Iftikhar Ahmad   +3 more
doaj   +1 more source

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