Exponential growth of solution with \(L_p\)-norm for class of non-linear viscoelastic wave equation with distributed delay term for large initial data
OMA-Vol. 4 (2020), Issue 1, pp. 76 – 83 Open Access Full-Text PDF
Abdelbaki Choucha, Djamel Ouchenane, Khaled Zennir
Abstract: In this work, we are concerned with a problem for a viscoelastic wave equation with strong damping, nonlinear source and distributed delay terms. We show the exponential growth of solution with \(L_{p}\)-norm, i.e., \(\lim\limits_{t\rightarrow \infty}\Vert u\Vert_p^p \rightarrow \infty\).
A new recursion for Bressoud’s polynomials
ODAM-Vol. 3 (2020), Issue 2, pp. 23 – 29 Open Access Full-Text PDF
Helmut Prodinger
Abstract: A new recursion in only one variable allows very simple verifications of Bressoud’s polynomial identities, which lead to the Rogers-Ramanujan identities. This approach might be compared with an earlier approach due to Chapman. Applying the \(q\)-Chu-Vandermonde convolution, as suggested by Cigler, makes the computations particularly simple and elementary. The same treatment is also applied to the Santos polynomials and perhaps more polynomials from a list of Rogers-Ramanujan like polynomials [1].
Reinterpreting the middle-levels theorem via natural enumeration of ordered trees
ODAM-Vol. 3 (2020), Issue 2, pp. 8 – 22 Open Access Full-Text PDF
Italo Jose Dejter
Abstract: Let \(0< k\in\mathbb{Z} \). A reinterpretation of the proof of existence of Hamilton cycles in the middle-levels graph \(M_k\) induced by the vertices of the \((2k+1)\)-cube representing the \(k\)- and \((k+1)\)-subsets of \(\{0,\ldots,2k\}\) is given via an associated dihedral quotient graph of \(M_k\) whose vertices represent the ordered (rooted) trees of order \(k+1\) and size \(k\).
Total dominator chromatic number of graphs with specific construction
ODAM-Vol. 3 (2020), Issue 2, pp. 1 – 7 Open Access Full-Text PDF
Saeid Alikhani, Nima Ghanbari
Abstract: Let \(G\) be a simple graph. A total dominator coloring of \(G\) is a proper coloring of the vertices of \(G\) in which each vertex of the graph is adjacent to every vertex of some color class. The total dominator chromatic number \(\chi_d^t(G)\) of \(G\) is the minimum number of colors among all total dominator coloring of \(G\). In this paper, we study the total dominator chromatic number of some graphs with specific construction. Also we compare \(\chi_d^t(G)\) with \(\chi_d^t(G-e)\), where \(e\in E(G)\).
A modified efficient difference-type estimator for population mean under two-phase sampling design
OMS-Vol. 4 (2020), Issue 1, pp. 195 – 199 Open Access Full-Text PDF
A. E. Anieting, J. K. Mosugu
Abstract: In this article, modified difference-type estimator for the population mean in two-phase sampling scheme using two auxiliary variables has been proposed. The mean squared error of the proposed estimator has also been derived using large sample approximation. The efficiency comparison conditions for the proposed estimator in comparison with other existing estimators in which the proposed estimator performed better than the other relevant existing estimators have been given.
Generalized the Liouville’s and Möbius functions of graph
OMS-Vol. 4 (2020), Issue 1, pp. 186 – 194 Open Access Full-Text PDF
Hariwan Fadhil M. Salih, Shadya Merkhan Mershkhan
Abstract: Let \(G = (V,E)\) be a simple connected undirected graph. In this paper, we define generalized the Liouville’s and Möbius functions of a graph \(G\) which are the sum of Liouville \(\lambda\) and Möbius \(\mu\) functions of the degree of the vertices of a graph denoted by \(\Lambda(G)=\sum\limits_{v\in V(G)}\lambda(deg(v))\) and \(M(G)=\sum\limits_{v\in V(G)}\mu(deg(v))\), respectively. We also determine the Liouville’s and Möbius functions of some standard graphs as well as determining the relationships between the two functions with their proofs. The sum of generalized the Liouville and Möbius functions extending over the divisor d of degree of vertices of graphs is also given.
