On Modal Logics Characterized by Models with Relative Accessibility Relations: Part I

This work is divided in two papers (Part I and Part II). In Part I, we study a class of polymodal logics (herein called the class of "Rare-logics") for which the set of terms indexing the modal operators are hierarchized in two levels: the set of Boolean terms and the set of terms built upon the set of Boolean terms. By investigating different algebraic properties satisfied by the models of the Rare-logics, reductions for decidability are established by faithfully translating the Rare-logics into more standard modal logics. The main idea of the translation consists in eliminating the Boolean terms by taking advantage of the components construction and in using various properties of the classes of semilattices involved in the semantics. The novelty of our approach allows us to prove new decidability results (presented in Part II), in particular for information logics derived from rough set theory and we open new perspectives to define proof systems for such logics (presented also in Part II).     

The causal role of theories of relationships: consequences for satisfaction and cognitive strategies

Two studies demonstrated the causal role of relationship theories in influencing relationship satisfaction and the processes affecting satisfaction. In both studies, participants were induced to hold either the soulmate or work-it-out theory. Feelings that one's partner was ideal (or not) were associated with relationship satisfaction more strongly for people induced to hold the soulmate theory than the work-it-out theory (Study 1). In Study 2, participants' beliefs about their relationships were threatened, and strategies for responding to this threat were assessed. Inducing people to hold the soulmate theory resulted in more relationship-enhancing cognitions if participants believed they were with the right person but more relationship-detracting cognitions if participants did not believe they were with the right person. These polarizing tendencies were enhanced under threat. In contrast, inducing people to hold a work-it-out theory produced almost no biased processing, leading people to process information similarly, regardless of their feelings about their partner.     

Beyond keeping active: concomitants of being a volunteer in old-old age

This study examines concomitants of volunteering in the context of other lifestyle activities. Investigating formal volunteering in old-old age, the authors analyzed data of 148 volunteers versus 1,195 nonvolunteers in a national sample of the Israeli Jewish population aged 75-94. As hypothesized, being a volunteer related (whether as a cause or effect) to more positive functioning on psychosocial markers and prospectively resulted in reduced mortality risk even when other activity outlets (physical activity, everyday activities, having a hobby) were controlled. These findings suggest that the benefits of volunteering in late life are not reducible to those of other activities.     

Context-dependent Abduction and Relevance

Based on the premise that what is relevant, consistent, or true may change from context to context, a formal framework of relevance and context is proposed in which

S5 knowledge without partitions

We study set algebras with an operator (SAO) that satisfy the axioms of S5 knowledge. A necessary and sufficient condition is given for such SAOs that the knowledge operator is defined by a partition of the state space. SAOs are constructed for which the condition fails to hold. We conclude that no logic singles out the partitional SAOs among all SAOs.     

JEWISH FOREIGN POLICY: ISRAEL,WORLD JEWRY AND THE DEFENCE OF “JEWISH INTERESTS”

Is there such a thing as a “Jewish foreign policy”? This article argues that Jewish foreign policy does in fact exist. It is not Israeli foreign policy, nor is it an aggregation of American Jewish political power and interests. Jewish foreign policy is not controlled by the Israeli Prime Minister, nor is it led by the myriad of Jewish communal organizations in the United States or elsewhere. It defies the traditional ‘Israel-diaspora’ dichotomy that all too often defines Jewish political discourse. Jewish foreign policy, like other systems of foreign policy, has its own distinctive set of interests and actors. It is a complex, informal, and de-centralized system of ethno-nationalist foreign policy. This article maps out the Jewish foreign policy system. In doing so, the following questions are addressed: Who are the actors involved? What are its interests? What are the challenges and problems facing the system?