Structural accessibility and similarity of possible worlds (Q1187978)

The central point of the combinatorial possible worlds theory is to develop a concept of a possible world as a possible combination of universals and individuals. In such a context one of the main problems is to distinguish two basic sorts of combinations: the possible ones and the impossible ones. In this paper, the author gives an explication of accessibility and similarity of possible worlds and shows that structural constraints flow directly from the conceptual structure of the actual world. The definition of a natural structural accessibility relation for combinatorial worlds is presented and its basic formal properties are considered.