INTRODUCTION The Navy Yard shooting at Washington DC, with 12 victims and gunman killed, after the deadly Sandy Hook massacre, has again reopened the debate on gun-shooting violence in the United States over the last 15 years; though in reality, a total of 62 episodes in schools and other sites occurred since 1982 (1). Who could have imagined that Columbine, CO, USA (15 died) in 1999 would fail...

Determining the set of all optimal solutions of a linear program with interval data is one of the main problems discussed in interval optimization. We review two methods based on duality in linear programming, which are used to approximate the optimal set. Additionally, another decomposition method based on complementary slackness is proposed. This method provides the exact description of the o...

I received much help in composing this solution set from Yoav Kerner, Binyamin Oz and Liron Ravner. Credit is given when due next to the appropriate questions. I am indebted to all three of them.

Assignment Problem (AP) is a very well-known and also useful decision making problem in real life situations. It becomes more effective when different criteria are added. To solve Multi-Criteria Assignment Problem (MCAP), the different criteria have been considered as neutrosophic elements because Neutrosophic Set Theory (NST) is a generalization of the classical sets, conventional fuzzy sets, ...