Topological indices are numerical parameters of a graph which characterize its topology. In this paper the PI, Szeged and Zagreb group indices of the tetrameric 1,3–adamantane are computed.

Katinka Ónodi-Nagy1*, Zsuzsanna Bata-Csörgő1, Erika Varga1, Lajos Kemény1 and Ágnes Kinyó1,2 1Department of Dermatology and Allergology, University of Szeged, Albert Szent-Györgyi Medical Center, Hungary 2Department of Dermatology, Venereology and Oncodermatology, University of Pécs, Hungary *Corresponding author: Katinka Ónodi-Nagy, Department of Dermatology and Allergology, University of Szeg...

The PI index is a graph invariant defined as the summation of the sums of edges of neu and nev over all the edges of connected graph G, where neu is the number of edges of G lying closer to u than to v and nev is the number of edges of G lying closer to v than to u. The index is very simple to calculate and has disseminating power similar to that of the Wiener and the Szeged indices. The compre...

Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study C. Linke, O. Möhler, A. Veres, Á. Mohácsi, Z. Bozóki, G. Szabó, and M. Schnaiter Forschungszentrum Karlsruhe, Institute of Meteorology and Climate Research, P.O. Box 3640, 76021 Karlsruhe, Germany University of Szeged, Faculty of Natural Sciences, Department of Optics and Quantum Elect...

(I.Ch.:) Department of Algebra and Geometry, Palacký University Olomouc, Tomkova 40, 779 00 Olomouc, Czech Republic (G.Cz. and E.K.H.:) University of Szeged, Bolyai Institute, Szeged, Aradi vértanúk tere 1, HUNGARY–6720. E-mail: [email protected], [email protected], [email protected]

CRISTINA TRANDAFIRESCU1, STEFANA AVRAM1*, CODRUTA SOICA1, ZOLTÁN AIGNER2, GYÉRESI ÁRPÁD3, MIHALY KATA2, CRISTINA DEHELEAN1, ZOLTÁN SZABADAI1, FLORIN BORCAN1 1Faculty of Pharmacy, Victor Babe’ University of Medicine and Pharmacy, 2nd Eftimie Murgu Sq., 300041, Timisoara, Romania 2Faculty of Pharmacy, University of Szeged, 6th Eötvös Str., Szeged, Hungary 3Faculty of Pharmacy, University of Medic...

1Department of Anaesthesiology and Intensive Therapy, Faculty of Medicine, University of Szeged, 6 Semmelweis St., Szeged 6725, Hungary 24th Department of Internal Medicine, Attikon University Hospital, 1 Rimini Str., 12462 Athens, Greece 3Sections of Critical Care Medicine and Infectious Diseases, Medical Microbiology and Pharmacology, University of Manitoba, Winnipeg, MB, Canada 4Department o...

The atom-bond connectivity (ABC) index is a degree-based graph topological index that found chemical applications. The problem of complete characterization of trees with minimal ABC index is still an open problem. In [14], it was shown that trees with minimal ABC index do not contain so-called Bk-branches, with k ≥ 5, and that they do not have more than four B4-branches. Our main results here r...

Received (received date) Revised (revised date) Communicated by (Name of Editor) ABSTRACT We study the wavelength problem and arc (edge) congestion problem for communicating permutation instances on a ring. We prove the best possible upper bounds on the number of wavelengths and arc (edge) congestion in both directed and undirected cases.