 Strong Nash equilibrium

A Strong Nash Equilibrium is a concept in game theory that extends the traditional notion of Nash equilibrium. In a typical Nash equilibrium, a set of strategies is considered stable if no single player can unilaterally change their strategy to achieve a better payoff, given the strategies of the other players. In contrast, a Strong Nash Equilibrium requires that no group of players can improve their payoff by jointly deviating from their current strategies.