Subjective Uncertainty over Behavior Strategies : A Correction * Running Title : Uncertainty over Behavior Strategies

In order to model the subjective uncertainty of a player over the behavior strategies of an opponent, one must consider the player i’s beliefs about the opponents’ play at information sets that player i thinks have probability 0. This erratum uses “trembles” to provide a definition of the convex hull of a set of behavior strategies. This corrects a definition we gave in [5], which led two of the solution concepts we defined there to not have the properties we intended.