Bondy and Chvatal [7] introduced a general and unified approach to a variety of graph-theoretic problems. They defined the k-closure Ck(G), where k is a positive integer, of a graph G of order n as the graph obtained from G by recursively joining pairs of nonadjacent vertices a,b satisfying the...

There is virtually a consensus that the ratio of suicides committed with guns to total suicides is the best way to indirectly measure gun ownership across different locations. However, such a proxy is not accurate for any locality with low population density in view that suicides are rare...

This study is part of Brasil 2035 a project whose objective is to provide subsidies to formulate long-term strategies for Brazil through Prospective Scenarios. The present text uses the prospective methodology, in order to present tendencies and uncertainties for public security. The article is...