This book was edited by J. Dopp from a nearly completed manuscript of Feys, and Dopp has added a bibliography and interstitial material where required. Feys has tried to survey the whole range of modal logic with the exception of topological and algebraic interpretations of modal structures and operators. First we are introduced to the modal propositional calculi through both historical and non-modal viewpoints; there are then formulated five systems of modal logic, with variants, with the standard required (...) reduction and other properties, and a number of useful metatheorems about decision-methods and derivability are proved. The chapter on modal functional logic first handles a modal system with first-order quantification, then extends it to include class-abstraction. Among other topics appearing in the book are extensions of modal calculi and the seemingly-paradoxical one of identity in modal functional calculi. Although there are some rough spots caused by the state of the manuscript itself, this book is more than adequate for extensive study in modal logic and should serve that purpose well.—P. J. M. (shrink)

Dopp is one of the very few logicians writing in French today, and so there are few textbooks of logic in that language. This is the newest one, and it is concerned essentially with the propositional and first-order predicate calculi, from both their historical as well as contemporary aspects. After examining the concepts of classical logic, Dopp presents the propositional calculus as a calculus of truth-functions and then gives it an axiomatic underpinning. In the treatment of quantification, first (...) traditional logic is presented, and then modern first-order logic with identity is examined in some detail, with attention to the technique of semantic tableaux. An appendix provides a number of alternative systems of the propositional calculus in axiomatic form.—P. J. M. (shrink)

Treatment of sexual minority youth presents psychologists with a number of challenging ethical considerations. The APA Ethics Code is a valuable resource for addressing these issues, but psychologists require additional guidance in order to provide ethical treatment. This article provides relevant background, an overview of the ethical considerations of treating sexual minority youth, and recommendations to improve upon the current state of awareness and available resources. Psychologists must continually strive to improve our understanding of ethical decisions around treatment, training, and (...) research that will serve to address this vulnerable population's unmet mental health needs. (shrink)

Recent studies indicate that mammalian chromosomes contain discretecis‐acting loci that control replication timing, mitotic condensation, and stability of entire chromosomes. Disruption of the large non‐coding RNA gene ASAR6 results in late replication, an under‐condensed appearance during mitosis, and structural instability of human chromosome 6. Similarly, disruption of the mouse Xist gene in adult somatic cells results in a late replication and instability phenotype on the X chromosome. ASAR6 shares many characteristics with Xist, including random mono‐allelic expression and asynchronous replication timing. (...) Additional “chromosome engineering” studies indicate that certain chromosome rearrangements affecting many different chromosomes display this abnormal replication and instability phenotype. These observations suggest that all mammalian chromosomes contain “inactivation/stability centers” that control proper replication, condensation, and stability of individual chromosomes. Therefore, mammalian chromosomes contain four types ofcis‐acting elements, origins, telomeres, centromeres, and “inactivation/stability centers”, all functioning to ensure proper replication, condensation, segregation, and stability of individual chromosomes. (shrink)