The Nakamura number of a simple game plays a critical role in preference aggregation (or multi-criterion ranking): the number of alternatives that the players can always deal with rationally is less than this number. We comprehensively study the restrictions that various properties for a simple...

This research develops a fuzzy multi-criteria decision-making (MCDM) model to solve problems regarding ecotourism. According to the definition of ecotourism, the authors identify critical criteria to distinguish the ecotour from regular voyages; therefore, these criteria serve as factors those...