2023-03

Open Journal of mathematical Sciences (Issue : 1) (Volume : 7)

In this work, generalized Euler’s Φw-function of edge weighted graphs is defined which consists of the sum of the Euler’s φ-function of the weight of edges of a graph and we denote it by Φw(G) and the general form of Euler’s Φw-function of some standard edge weighted graphs is determined. Also, we define the divisor sum Tkw-function Tkw(G) of the graph G, which is counting the sum of the sum of the positive divisor σk-function for the weighted of edges of a graph G. It is determined a relation between generalized Euler’s Φw-function and generalized divisor sum Tkw-function of edge weighted graphs.

2020-05

Open Journal of Mathematical Sciences (Issue : 1) (Volume : 4)

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 λ and Möbius µ functions of the degree of the vertices of a graph denoted by Λ(G) = ∑v∈V(G)λ(deg(v)) and M(G) = ∑v∈V(G)µ(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

2019-12

New Trends in Mathematical Sciences (Issue : 4) (Volume : 7)

This paper is aimed to introduce a new class of functions called almost Pp-continuous functions by using Pp-open sets in topological spaces. Also some properties and characterizations are studied.

2019-09

General Letters in Mathematics (Refaad) (Issue : 1) (Volume : 7)

In this paper, the concepts of Pp-compact spaces by using nets, filter base and Pp-complete accumulation points are introduced and studied.

2019-06

New Trends in Mathematical Sciences (Issue : 2) (Volume : 7)

In this paper, we apply the notion of Pp-open sets in topological spaces to present and study a new class of functions called contra Pp-continuous functions which lies between classes of contra θ-continuous functions and contra-precontinuous functions. It is shown that contra Pp-continuous is weaker than contra θ-continuous, but it is stronger than contra-precontinuous and weakly Pp-continuous. Furthermore, we obtain basic properties and preservation theorems of contra Pp-continuity.

2014-01

GMN Journal (Issue : 1) (Volume : 20)

In this paper we introduce a new class of sets, called Pp-open sets, also using this set, we define and investigate some properties of the concept of Pp-continuity. In particular, Pp-open sets and Pp-continuity are defined to extend known results for preopen sets and pre-continuity.