A weakening of covariance property for solutions of cooperative games with transferable utilities - self-covariance - is defined. Self-covariant solutions are positively homogenous and satisfy a "restricted" translation covariance such that feasible shifts are only the solution vectors...

A game with a restricted cooperation is a triple consisting of a finite set of players, a collection of feasible coalitions, and a characteristic function. The class of all games with a restricted cooperation with an arbitrary universal set of players is considered.The prenucleolus and the...