Results 21 to 30 of about 273,375 (330)

Structural Analysis and Topological Characterization of Sudoku Nanosheet

Journal of Mathematics, 2022
The physical and biological properties of chemical compounds are modelled using chemical graph theory. The geometric structure of chemical compounds can be modelled using a variety of topological indices derived from graph theory. The chemical structures,
Shahid Zaman, Mehwish Jalani, Asad Ullah, Ghulamullah Saeedi   +3 more
doaj   +1 more source

The Calculations of Topological Indices on Certain Networks

Journal of Mathematics, 2021
It is one of the core problems in the study of chemical graph theory to study the topological index of molecular graph and the internal relationship between its structural properties and some invariants.
Jia-Bao Liu, Ting Zhang, Sakander Hayat
doaj   +1 more source

Groupoids and an index theorem for conical pseudo-manifolds [PDF]

, 2006
We define an analytical index map and a topological index map for conical pseudomanifolds. These constructions generalize the analogous constructions used by Atiyah and Singer in the proof of their topological index theorem for a smooth, compact manifold
Baaj Saad, Cheeger J., Claire Debord, da Silva A. Cannas, Debord C., Fedosov B., Freed D., Gorokhovsky A., Hilsum M., Jean-Marie Lescure, Kasparov G. G., Lauter R., Lescure J.-M., Mackenzie K., Melo S. T., Melrose R. B., Muhly P., Nazaikinskii V. E., Nazakinski V. E., Nistor V., Victor Nistor   +20 more
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On Distance-Based Topological Descriptors of Chemical Interconnection Networks

Journal of Mathematics, 2021
Structure-based topological descriptors of chemical networks enable us the prediction of physico-chemical properties and the bioactivities of compounds through QSAR/QSPR methods.
Min Hu, Haidar Ali, Muhammad Ahsan Binyamin, Bilal Ali, Jia-Bao Liu, Chengmei Fan   +5 more
doaj   +1 more source

GTI-space : the space of generalized topological indices [PDF]

, 2008
A new extension of the generalized topological indices (GTI) approach is carried out torepresent 'simple' and 'composite' topological indices (TIs) in an unified way.
A.R Matamala, A.R Matamala, A.T Balaban, Adelio R. Matamala, B Zhou, D. Plavšić, D.J Klein, D.J Klein, D.J Klein, E Estrada, E Estrada, E. Estrada, E. Estrada, E. Estrada, E. Estrada, E. Estrada, Ernesto Estrada, G.G Cash, H Wiener, H.P Schultz, H.P Schultz, I Gutman, I Gutman, I Gutman, I Gutman, J. Gálvez, J. Gálvez, J.R Votano, M. Randić, M. Randić, O Ivanciuc, R Todeschini, R.F Brown, W.R. Müller, Z. Mihalić   +34 more
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Topological Steric Effect Index and Its Application. [PDF]

ChemInform, 2004
This paper proposed a Topological Steric Effect Index (TSEI) of a group based on the relative specific volume of the reaction center screened by the atoms of the substituents. Investigated results show good correlations between the parameter TSEI and the dihedral angles between both phenyl rings determined by photoelectron spectroscopy for 7 ...
Chenzhong, Cao, Li, Liu
openaire   +2 more sources

M-Polynomials and Topological Indices for Line Graphs of Chain Silicate Network and H-Naphtalenic Nanotubes

Journal of Mathematics, 2021
Graph theory has provided a very useful tool, called topological index, which is a number from the graph M with the property that every graph N isomorphic to M value of a topological index must be same for both M and N.
Muhammad Irfan, Hamood Ur Rehman, Hassan Almusawa, Saffina Rasheed, Imran Abbas Baloch   +4 more
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Topological dynamics indexed by words

Topology and its Applications, 2012
20 ...
Farmaki, V., Koutsogiannis, A.
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Computation of eccentric topological indices of zero-divisor graphs based on their edges

AIMS Mathematics, 2022
The topological index of a graph gives its topological property that remains invariant up to graph automorphism. The topological indices which are based on the eccentricity of a chemical graph are molecular descriptors that remain constant in the whole ...
Ali N. A. Koam, Ali Ahmad , Azeem Haider, Moin A. Ansari   +3 more
doaj   +1 more source

The topological period-index conjecture

Mathematical Research Letters, 2021
comments ...
Antieau, Benjamin, Williams, Ben
openaire   +2 more sources