 The agent’s choice dispositions at a given point in time are taken to be determined by his or her preferences, in such a way that, from any set of particular acts, the agent is liable to choose all and only those acts to which no other act is strictly preferred. \(f\succeq g\) will denote the fact that an agent finds act \(f\) to be no less desirable than act \(g\). \(\succ\) (strict preference) and \(\sim\) (indifference) respectively stand for the asymmetric and symmetric parts of \(\succeq\), so that \(f\succ g\) iff \(f\succeq g\) but not \(g\succeq f\) and \(f\sim g\) iff both \(f\succeq g\) and \(g\succeq f\). It is convenient to extend this preference relation to the set of outcomes by setting, for all outcomes \(x_1\) and \(x_2\), \(x_1\succeq x_2\) iff the constant act that yields \(x_1\) in all states is weakly preferred to the one that yields \(x_2\) in all states.