One of the most controversial issues about arguments involving deontic and ethical matters is whether statements of duty or right can be inferred from statements of fact, and conversely. Most analytical philosophers have inclined to give a negative answer, alleging that duties or rights are not implied by mere facts (or the other way round), and hence that no combination of facts can imply a du...

In this paper we study two-sided, one-to-one matching problems and consider the most wellknown solution concept: the men-optimal solution. The men-optimal solution fails to satisfy consistency as well as converse consistency. Thanks to Sasaki and Toda (1992), we know that the minimal consistent extension of the men-optimal solution equals the core (Thomson, 1994a). In this paper, we compute the...

We describe the natural connection between model theory and generalized polygons and give some applications of one theory to the other.