Hellmut O Pappe(unpublished) Sismondi, Constant and Tocqueville

Hellmut Pappe died in 1998. Since the publication of Sismondi’s Weggenossen (Geneva, 1956), he had been planning a new biography of Sismondi intended both to replace J. R. Salis’s Sismondi, 1775-1842: la vie et l'oeuvre d'un cosmopolite philosophe (1932) and to give a fuller view of Sismondi’s influence, particularly over significant luminaries of nineteenth century European thought. Although Hellmut Pappe continued working until his death, his published work in this field was limited to a number of articles on Sismondi and editions of such works as the ‘Statitique du Departement du Leman’. Among the papers he left to the University of Sussex, however, were transcriptions of Sismondi’s mother and sister’s diaries, three chapters of the biography describing Sismondi’s life up to 1800, and some miscellaneous papers, destined for the second volume of the biography, describing Sismondi’s relationships with his contemporaries. The paper published here comes from the latter collection and appears to have been one of the last papers that Hellmutt Pappe completed. For reasons of brevity, the version of the paper published here omits the final section of the manuscript version, dealing with Sismondi’s view of North America, in addition to several of the more extensive notes. The paper underlines Pappe’s concern to restore Sismondi to the first rank of European political economists and historians

Quintic threefolds and Fano elevenfolds

The derived category of coherent sheaves on a general quintic threefold is a central object in mirror symmetry. We show that it can be embedded into the derived category of a certain Fano elevenfold. Our proof also generates related examples in different dimensions.Comment: V1: 12 pages. V2: added reference to work of Iliev and Manivel. V3: persistent sign error corrected. Other minor changes following referee's suggestions. To appear in Crell

The tale of Gresham's law

Gresham’s law, which says that bad money tends to drive good money out of circulation, may account for many nations’ episodes of money troubles, as far back as ancient Athens. This Commentary discusses the two main explanations for Gresham’s law and suggests some circumstances in which the law does not apply.Gresham's law ; Money

On the recognizability of money

This paper develops a model of currency circulation under asymmetric information. Agents are heterogeneous and trade in bilateral matches. Coins are intrinsically valuable and are available in two weights, light and heavy. We characterize the equilibrium under complete information and under imperfect information about the quality of coins. We determine a set of conditions under which the two currencies circulate and are traded according to different terms of trade. We study how output, welfare, and the velocity of currency are affected by the recognizability of coins. We show that society's welfare increases as coins become more easily recognizable.Money

Universal Protocols for Information Dissemination Using Emergent Signals

We consider a population of $n$ agents which communicate with each other in a decentralized manner, through random pairwise interactions. One or more agents in the population may act as authoritative sources of information, and the objective of the remaining agents is to obtain information from or about these source agents. We study two basic tasks: broadcasting, in which the agents are to learn the bit-state of an authoritative source which is present in the population, and source detection, in which the agents are required to decide if at least one source agent is present in the population or not.We focus on designing protocols which meet two natural conditions: (1) universality, i.e., independence of population size, and (2) rapid convergence to a correct global state after a reconfiguration, such as a change in the state of a source agent. Our main positive result is to show that both of these constraints can be met. For both the broadcasting problem and the source detection problem, we obtain solutions with a convergence time of $O(\log^2 n)$ rounds, w.h.p., from any starting configuration. The solution to broadcasting is exact, which means that all agents reach the state broadcast by the source, while the solution to source detection admits one-sided error on a $\varepsilon$-fraction of the population (which is unavoidable for this problem). Both protocols are easy to implement in practice and have a compact formulation.Our protocols exploit the properties of self-organizing oscillatory dynamics. On the hardness side, our main structural insight is to prove that any protocol which meets the constraints of universality and of rapid convergence after reconfiguration must display a form of non-stationary behavior (of which oscillatory dynamics are an example). We also observe that the periodicity of the oscillatory behavior of the protocol, when present, must necessarily depend on the number ^\\# X of source agents present in the population. For instance, our protocols inherently rely on the emergence of a signal passing through the population, whose period is \Theta(\log \frac{n}{^\\# X}) rounds for most starting configurations. The design of clocks with tunable frequency may be of independent interest, notably in modeling biological networks

Acute stress disorder and posttraumatic stress disorder in children and adolescents involved in assaults or motor vehicle accidents

Objective: The authors investigated acute stress disorder and later posttraumatic stress disorder (PTSD) in children and adolescents who had been involved in assaults or motor vehicle accidents. Method: They interviewed 93 patients 10-16 years old who were seen in an emergency department for having been assaulted or involved in a motor vehicle accident within 4 weeks after the assault or accident to assess acute stress disorder. At 6 months, they reinterviewed 64 (68.8%) of the patients to assess PTSD. Results: At initial interview, 18 (19.4%) of the 93 patients had acute stress disorder and 23 (24.7%) met all acute stress disorder criteria except dissociation. At 6 months, eight of the 64 patients (12.5%) had PTSD. Acute stress disorder and PTSD did not differ in prevalence between patients who had been assaulted and those who had been in accidents. Sensitivity and specificity statistics and regression modeling revealed that the diagnosis of acute stress disorder was a good predictor of later PTSD but that dissociation did not play a significant role. Conclusions: Acute stress disorder has merit as a predictor of later PTSD in children and adolescents, but dissociation has questionable utility

Buildings and Grounds of Yale University

This third edition has been expanded to include the grounds as well as the buildings of Yale University. The date of publication follows closely the retirement of President Brewster and therefore includes the new buildings and the renovations of older structures completed during his term of office. The book also lists all Yale buildings now standing and used for university purposes and, where information is available, it records buildings no longer standing. Thus its purpose is mainly historical, to catalogue such basic facts as the date and style of construction, location, name of the architect, and the uses which the facilities have provide from the time of acquisition to the present. Henry Chauncey, Jr., Secretary of the University [from the Preface