Trembling hand perfect equilibrium is a refinement of Nash Equilibrium due to Reinhard Selten. A trembling hand perfect equilibrium is an equilibrium that takes the possibility of off-the-equilibrium play into account by assuming that the players, through a "slip of the hand" or tremble, may choose unintended strategies, albeit with negligible probability.
Read more about Trembling Hand Perfect Equilibrium: Definition, Example, Trembling Hand Perfect Equilibria of Two-player Games, Trembling Hand Perfect Equilibria of Extensive Form Games
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