<math>\forall i, j, \forall s_k, s_m \in A_i, p(s \in A_j | s_k) = p(s \in A_j | s_m)</math>,其中,<math>p(s \in A_j | s_k) = \sum_{s_q \in A_j} p( s_q | s_k)</math> | <math>\forall i, j, \forall s_k, s_m \in A_i, p(s \in A_j | s_k) = p(s \in A_j | s_m)</math>,其中,<math>p(s \in A_j | s_k) = \sum_{s_q \in A_j} p( s_q | s_k)</math> |