Results 31 to 40 of about 51,997 (309)

Cellularity and the index of narrowness in topological groups [PDF]

, 1997
summary:We study relations between the cellularity and index of narrowness in topological groups and their $G_\delta$-modifications. We show, in particular, that the inequalities $\operatorname{in} ((H)_\tau)\le 2^{\tau\cdot \operatorname{in} (H)}$ and ...
Tkachenko, M., E.A. Reznichenko, O.V. Sipacheva, Sipacheva, O.V., Reznichenko, E.A., Gartside, P.M., P.M. Gartside   +6 more
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COMPUTING FORGOTTEN ECCENTRIC TOPOLOGICAL INDEX OF COMPLEMENT OF LINE GRAPHS [PDF]

, 2022
The forgotten topological index of a graph G is defined as the sum of the cube of the degrees of its vertices. In this paper we establish the forgotten eccentric topological index of complement of line graphs and it is denoted by .
Shiladhar Pawar
core   +1 more source

Eccentric topological properties of a graph associated to a finite dimensional vector space

Main Group Metal Chemistry, 2020
A topological index is actually designed by transforming a chemical structure into a number. Topological index is a graph invariant which characterizes the topology of the graph and remains invariant under graph automorphism.
Liu Jia-Bao, Khalid Imran, Rahim Mohammad Tariq, Rehman Masood Ur, Ali Faisal, Salman Muhammad   +5 more
doaj   +1 more source

Computation of Several Banhatti and Reven Invariants of Silicon Carbides

مجلة بغداد للعلوم, 2023
Expressions for the molecular topological features of silicon carbide compounds are essential for quantitative structure-property and structure-activity interactions.
Abid Mahboob, Muhammad Waheed Rasheed, Jalal Hatem Hussein Bayati, Iqra Hanif   +3 more
doaj   +1 more source

Relating the ABC and harmonic indices [PDF]

Journal of the Serbian Chemical Society, 2014
The atom-bond connectivity (ABC) index is a much-studied molecular structure descriptor, based on the degrees of the vertices of the molecular graph.
Gutman Ivan, Zhong Lingping, Xu Kexiang
doaj   +1 more source

Design of Graded Topological Resonator for Sensitivity Improvement [PDF]

, 2023
In this paper, a hyperbolic-graded topological nanophotonic resonator is proposed to excite topologically protected edge states (TES). The index grading is introduced to modify the dispersion characteristics and enhance the mode field confinement of TES.
Massoud, Yehia Mahmoud, Saini, Jasmine, Dash, Diptimayee, Goyal, Amit   +3 more
core   +1 more source

Degree-Based Topological Indices of Boron B12

Journal of Chemistry, 2021
Topological index sometimes called molecular descriptor is a numerical value which associates a chemical composition for correlating chemical structure with numerous physical properties, chemical reactivity, or biological activity.
Nouman Saeed, Kai Long, Zeeshan Saleem Mufti, Hafsa Sajid, Abdul Rehman   +4 more
doaj   +1 more source

Mostar Index of Cycle-Related Structures

Journal of Chemistry, 2022
A topological index is a numerical quantity associated with the molecular structure of a chemical compound. This number remains fixed with respect to the symmetry of a molecular graph.
Fatima Asif, Agha Kashif, Sohail Zafar, Michael Onyango Ojiema   +3 more
doaj   +1 more source

Index Theorem on Chiral Landau Bands for Topological Fermions [PDF]

, 2021
Topological fermions as excitations from multidegenerate Fermi points have been attracting increasing interest in condensed matter physics. They are characterized by topological charges, and magnetic fields are usually applied in experiments for their ...
Zhao, Y. X., Yang, Shengyuan A.
core   +1 more source

Hosoya, Schultz, and Gutman Polynomials of Generalized Petersen Graphs Pn,1 and Pn,2

Journal of Mathematics, 2023
The graph theory has wide important applications in various other types of sciences. In chemical graph theory, we have many topological polynomials for a graph G through which we can compute many topological indices.
Ramy Shaheen, Suhail Mahfud, Qays Alhawat   +2 more
doaj   +1 more source