Models in cooperative game theory : crisp fuzzy and multi choice games This book investigates models in cooperative game theory in which the players have the possibility to cooperate partially. In a crisp game the agents are either fully involved or not involved at all in coperation with some other agents while in a fuzzy game players are allowed to cooperate with infinite many different participation levels varying from non cooperation to full cooperation. A multi choice game describes the intermediate case in which each player may have a fixed number of activity levels. Different set and one point solution concepts for these games are presented. The properties of these solution concepts and their interrelations on several classes of crisp fuzzy and multi choice games are studied. Applications of the investigated models to many economic situations are indicated as well.