Results 91 to 100 of about 1,343 (197)
Four‐Dimensional pp‐Wave Lie Groups and Harmonic Curvature
Mathematische Nachrichten, Volume 299, Issue 7, Page 1751-1780, July 2026.ABSTRACT We determine all four‐dimensional Lie groups which have harmonic curvature. In parallel, a description of four‐dimensional pp‐wave Lie groups is obtained.
E. García‐Río +2 more
wiley +1 more source
Notions of Rough Neutrosophic Digraphs
Mathematics, 2018 [-3]Graph theory has numerous applications in various disciplines, including computer networks, neural networks, expert systems, cluster analysis, and image capturing. Rough neutrosophic set (NS) theory is a hybrid tool for handling uncertain information
Nabeela Ishfaq +3 more
doaj +1 more source
Skew-spectra and skew energy of various products of graphs [PDF]
Transactions on Combinatorics, 2015 Given a graph $G$, let $G^sigma$ be an oriented graph of $G$ with the orientation $sigma$ and skew-adjacency matrix $S(G^sigma)$. Then the spectrum of $S(G^sigma)$ consisting of all the eigenvalues of $S(G^sigma)$ is called the skew-spectrum of $G ...
Xueliang Li, Huishu Lian
doaj
A new upper bound of the basis number of the lexicographic product of graphs [PDF]
, 2010 An upper bound of the basis number of the lexicographic product of two graphs from the basis number of the factors is presented.
Jaradat, M.M.M.
core
Some cardinal functions in lexicographic products of LOTS [PDF]
, 2017 The Lindel\"{o}f degree and extent were studied in \cite{BCW} in relation to lexicographic products of linearly ordered spaces. In this paper we consider the behaviour of other important cardinal functions in such lexicographic products.
Chetcuti, Emmanuel +5 more
core +1 more source
Indonesian Journal of Combinatorics, 2018 An edge magic total (EMT) labeling of a graph G = (V, E) is a bijection from the set of vertices and edges to a set of numbers defined by λ : V ∪ E → {1, 2, ..., ∣V∣ + ∣E∣} with the property that for every xy ∈ E, the weight of xy equals to a constant k,
Inne Singgih
doaj +1 more source
Hamiltonian Decomposition of Lexicographic Products of Digraphs
Journal of Combinatorial Theory, Series B, 1998 We partially resolve a conjecture of Alspach, Bermond, and Sotteau by showing that the lexicographic product of two hamiltonian decomposable digraphs, the first of odd order, is itself hamiltonian decomposable in general.
openaire +1 more source
The lexicographic preference for a son: evidence from household data in Vietnam [PDF]
This paper examines son preferences by specifying sex composition by birth order of existing children as key independent variables. The results indicate a lexicographic preference for a son by mothers aged 50 years and older.
Tien Manh Vu
core
Minimum cycle bases of lexicographic products
Ars Mathematica Contemporanea, 2012 Minimum cycle bases of product graphs can in most situations be constructed from minimum cycle bases of the factors together with a suitable collection of triangles and/or quadrangles determined by the product operation. Here we give an explicit construction for the lexicographic product G o H that generalizes results by Berger and Jaradat to the case ...
Hellmuth, Marc +2 more
openaire +3 more sources
Infinite lexicographic products of positional objectives
CoRRThis paper contributes to the study of positional determinacy of infinite duration games played on potentially infinite graphs with neutral transitions. Recently, [Ohlmann, TheoretiCS 2023] established that positionality of prefix-independent objectives is preserved by finite lexicographic products.
Antonio Casares +3 more
openaire +2 more sources