preserves all symmetries of the former one. The operation defined this way respects the restriction of games to subgames and …

restriction of games to subgames and yield a minimal total rank of the tree involved. Moreover, by the above requirements the … 'canonical extensive game form' will be uniquely defined. Part I is dealing with isomorphisms of game forms and games. An … on the existence of symmetry groups are presented. The context to the notion of symmetry for coalitional games is …

and a robust Nash equilibrium is shown to exist for every game. In symmetric bimatrix games, our results imply the …