We consider the monodic formulas of common knowledge predicate logic, which allow applications of epistemic operators to formulas with at most one free variable. We provide nite axiomatizations of the monodic fragment of the most important common knowledge predicate logics (the full logics are known to be not recursively enumerable) and single out a number of their decidable fragments. On the o...

A formula '(x 1 ; : : :; x n) conforms to a partition P of fx 1 ; : : :; x n g if it is equivalent to a Boolean combination of formulae that do not have free variables from more than one block of P. We show that if ' conforms to two partitions P 1 and P 2 , it also conforms to their greatest lower bound in the partition lattice. As a corollary, we obtain that the concept of orthographic dimensi...

The issue of the breakdown of the marriage bond in Western societies has become a routine object of social and moral concern, political and public debate. This is striking, given that in most non-western cultures still and in every society heretofore, marriage has been insisted upon as the required precondition for the mating of men and women as the act that initiates and sustains the family or...

This paper reports our ongoing research effort to develop a system which translates legal texts into logical forms in which we can check for inconsistency. Our logical formalization conforms to Davidsonian Style, which is suitable for languages allowing expressions with zero-pronouns such as Japanese. We examine our system with actual data of legal documents. As a result, the system was 78% of ...

Second-order uniication is undecidable in general. Miller showed that uniication of so-called higher-order patterns is decidable and unitary. We show that the uniication of a linear higher-order pattern s with an arbitrary second-order term that shares no variables with s is decidable and nitary. A few extensions of this uniication problem are still decidable: unifying two second-order terms, w...