"
Reinhard Selten added more criteria to this idea to account for small accidental perturbations so that they be "trembling hand perfect." This concept requires that any two participant's beliefs about a third participant be the same, and also requires that no action involved is "strictly dominated" by another. An example of it that does not have this pure-strategy form of it is the matching pennies game; in the Prisoner's Dilemma, the only instance of it is when both participants defect. For 10 points, name this concept in game theory, in which each player's set of actions is a best response to the other player, and which is named after a schizophrenic mathematician.
Reinhard Selten added more criteria to this idea to account for small accidental perturbations so that they be "trembling hand perfect.
Nash Equilibrium