Strongly perfect graphs were introduced by C. Berge and P. Duchet in [1]. In [4], [3] the following was studied: the problem of strong perfectness for the Cartesian product, the tensor product, the symmetrical difference of n, n ≥ 2, graphs and for the generalized Cartesian product of graphs. Co-strong perfectness was first studied by G. Ravindra and D. Basavayya [5]. In this paper we discuss s...

In order to fulfil sets of similar user requirements within a specific application domain, one typically uses software product line engineering. In this paper, we investigate the nature of implementations of concerns, specific to software product line engineering. Based on these investigations, we present an approach that allows a modular specification and composition of concerns, with the purp...

The F-index of a graph is defined as the sum of cubes of the vertex degrees of the graph. In this paper, we introduce a new invariant which is named as F-coindex. Here, we study basic mathematical properties and the behavior of the newly introduced F-coindex under several graph operations such as union, join, Cartesian product, composition, tensor product, strong product, corona product, disjun...

This paper examines the impact of the outsourcing of production on the volume and composition of the home country’s research and development. We find that outsourcing decreases the process R&D of the multinational firm in large markets when it only conducts process R&D (the substitution effect between outsourcing and process R&D). Outsourcing tends to emerge as a complementary factor to product...